http://prl.aps.org/ Iron-based superconductor articles published in Physical Review Journals en-us Copyright (c) 2009 The American Physical Society 2009-11-22T20:25:59-05:00 assocpub@aps.org rss@aps.org hourly 4 2009-11-22T20:25:59-05:00 rss@aps.org http://link.aps.org/doi/10.1103/PhysRevB.80.180418 Author(s): C.-C. Chen, B. Moritz, J. van den Brink, T. P. Devereaux, and R. R. P. Singh<br/>We study finite temperature properties of a generic spin-orbital model relevant to transition metal compounds, having coupled quantum Heisenberg-spin and Ising-orbital degrees of freedom. The model system undergoes a phase transition, consistent with that of a two-dimensional Ising model, to an orbi...<br/><img src="http://prola.aps.org/graphics/rapid30x30.gif" width="30" height="30" alt="Rapid Communication"/><br/>[Phys. Rev. B 80, 180418] Published Thu Nov 19, 2009 C.-C. Chen, B. Moritz, J. van den Brink, T. P. Devereaux, and R. R. P. Singh 2009-11-19T00:00:00-05:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevB.80.180418 Phys. Rev. B 80, 180418 text/html article Physical Review B 80 18 2009-11-19T00:00:00-05:00 180418 Magnetism Magnetism http://link.aps.org/doi/10.1103/PhysRevB.80.174517 Author(s): R. Prozorov, M. A. Tanatar, N. Ni, A. Kreyssig, S. Nandi, S. L. Bud’ko, A. I. Goldman, and P. C. Canfield<br/>Critical current density was studied in single crystals of Ba(Fe_{1−x} Co_{x} )_{2} As_{2} for the values of x spanning the entire doping phase diagram. A noticeable enhancement was found for slightly underdoped crystals with the peak at x=0.058 . Using a combination of polarized-light imaging, x-...<br/>[Phys. Rev. B 80, 174517] Published Wed Nov 18, 2009 R. Prozorov, M. A. Tanatar, N. Ni, A. Kreyssig, S. Nandi, S. L. Bud’ko, A. I. Goldman, and P. C. Canfield 2009-11-18T00:00:00-05:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevB.80.174517 Phys. Rev. B 80, 174517 text/html article Physical Review B 80 17 2009-11-18T00:00:00-05:00 174517 Superfluidity and superconductivity Superfluidity and superconductivity http://link.aps.org/doi/10.1103/PhysRevB.80.180507 Author(s): Takuya Kato, Yoshikazu Mizuguchi, Hiroshi Nakamura, Tadashi Machida, Hideaki Sakata, and Yoshihiko Takano<br/>We report on the investigation of the quasiparticle local density of states and superconducting gap in the iron chalcogenide superconductor Fe_{1+δ} Se_{1−x} Te_{x} (T_{c} ∼14 K) . The surface of a cleaved crystal revealed an atomic square lattice, superimposed on the inhomogeneous background...<br/><img src="http://prb.aps.org/files/SuggestionPRB30x30.jpg" alt="PRB Editors' Suggestion"/><br/> <img src="http://prola.aps.org/graphics/rapid30x30.gif" width="30" height="30" alt="Rapid Communication"/><br/>[Phys. Rev. B 80, 180507] Published Tue Nov 17, 2009 Takuya Kato, Yoshikazu Mizuguchi, Hiroshi Nakamura, Tadashi Machida, Hideaki Sakata, and Yoshihiko Takano 2009-11-17T00:00:00-05:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevB.80.180507 Phys. Rev. B 80, 180507 text/html article Physical Review B 80 18 2009-11-17T00:00:00-05:00 180507 Superfluidity and superconductivity Superfluidity and superconductivity http://link.aps.org/doi/10.1103/PhysRevB.80.172504 Author(s): B. Mansart, D. Boschetto, A. Savoia, F. Rullier-Albenque, A. Forget, D. Colson, A. Rousse, and M. Marsi<br/>We report the observation of a coherent lattice oscillation in a pnictide superconductor. A coherent fully symmetric optical phonon was detected in Ba(Fe_{1−x} Co_{x} )_{2} As_{2} ( x=0.06 and x=0.08 ) using time-resolved pump-probe reflectivity with 40 fs time resolution. The analysis of the phon...<br/>[Phys. Rev. B 80, 172504] Published Mon Nov 16, 2009 B. Mansart, D. Boschetto, A. Savoia, F. Rullier-Albenque, A. Forget, D. Colson, A. Rousse, and M. Marsi 2009-11-16T00:00:00-05:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevB.80.172504 Phys. Rev. B 80, 172504 text/html article Physical Review B 80 17 2009-11-16T00:00:00-05:00 172504 Superfluidity and superconductivity Superfluidity and superconductivity http://link.aps.org/doi/10.1103/PhysRevB.80.180505 Author(s): Ronny Thomale, Christian Platt, Jiangping Hu, Carsten Honerkamp, and B. Andrei Bernevig<br/>We use the functional renormalization group to analyze the phase diagram of a four-band model for the iron pnictides subject to band interactions with certain A_{1g} momentum dependence. We determine the parameter regimes where an extended s -wave pairing instability with and without nodes emerges. ...<br/><img src="http://prola.aps.org/graphics/rapid30x30.gif" width="30" height="30" alt="Rapid Communication"/><br/>[Phys. Rev. B 80, 180505] Published Fri Nov 13, 2009 Ronny Thomale, Christian Platt, Jiangping Hu, Carsten Honerkamp, and B. Andrei Bernevig 2009-11-13T00:00:00-05:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevB.80.180505 Phys. Rev. B 80, 180505 text/html article Physical Review B 80 18 2009-11-13T00:00:00-05:00 180505 Superfluidity and superconductivity Superfluidity and superconductivity http://link.aps.org/doi/10.1103/PhysRevB.80.172503 Author(s): G. A. Ummarino, M. Tortello, D. Daghero, and R. S. Gonnelli<br/>Superconductivity in iron pnictides has been recently proposed to be due to spin-fluctuation mediated coupling between hole and electron bands with order parameters of opposite sign. BCS multiband models give qualitative predictions but cannot simultaneously reproduce the experimental values of crit...<br/>[Phys. Rev. B 80, 172503] Published Wed Nov 11, 2009 G. A. Ummarino, M. Tortello, D. Daghero, and R. S. Gonnelli 2009-11-11T00:00:00-05:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevB.80.172503 Phys. Rev. B 80, 172503 text/html article Physical Review B 80 17 2009-11-11T00:00:00-05:00 172503 Superfluidity and superconductivity Superfluidity and superconductivity http://link.aps.org/doi/10.1103/PhysRevB.80.174512 Author(s): A. E. Karkin, J. Werner, G. Behr, and B. N. Goshchitskii<br/>The effect of atomic disordering induced by fast neutron irradiation on normal and superconducting state properties of polycrystalline LaFeAsO_{0.9} F_{0.1} samples was investigated. Fast neutron (E>0.1 MeV) irradiation to a “moderate” fluence Φ=1.6×10^{19}  cm^{−2} at T_{irr} =50±10 Â...<br/>[Phys. Rev. B 80, 174512] Published Wed Nov 11, 2009 A. E. Karkin, J. Werner, G. Behr, and B. N. Goshchitskii 2009-11-11T00:00:00-05:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevB.80.174512 Phys. Rev. B 80, 174512 text/html article Physical Review B 80 17 2009-11-11T00:00:00-05:00 174512 Superfluidity and superconductivity Superfluidity and superconductivity http://link.aps.org/doi/10.1103/PhysRevLett.103.207001 Author(s): Wei-Qiang Chen, Fengjie Ma, Zhong-Yi Lu, and Fu-Chun Zhang<br/>Josephson junctions between a FeAs-based superconductor with antiphase s-wave pairing and a conventional s-wave superconductor are studied. The translational invariance in a planar junction between a single crystal pnictide and an aluminum metal greatly enhances the relative weight of electron pocke...<br/>[Phys. Rev. Lett. 103, 207001] Published Tue Nov 10, 2009 Wei-Qiang Chen, Fengjie Ma, Zhong-Yi Lu, and Fu-Chun Zhang 2009-11-10T00:00:00-05:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevLett.103.207001 Phys. Rev. Lett. 103, 207001 text/html article Physical Review Letters 103 20 2009-11-10T00:00:00-05:00 207001 Condensed Matter: Electronic Properties, etc. Condensed Matter: Electronic Properties, etc. http://link.aps.org/doi/10.1103/PhysRevB.80.174509 Author(s): T. J. Liu, X. Ke, B. Qian, J. Hu, D. Fobes, E. K. Vehstedt, H. Pham, J. H. Yang, M. H. Fang, L. Spinu, P. Schiffer, Y. Liu, and Z. Q. Mao<br/>We have investigated the effect of Fe nonstoichiometry on properties of the Fe_{1+y} (Te,Se) superconductor system by means of resistivity, Hall coefficient, magnetic susceptibility, and specific-heat measurements. We find that the excess Fe at interstitial sites of the (Te, Se) layers not only supp...<br/>[Phys. Rev. B 80, 174509] Published Mon Nov 09, 2009 T. J. Liu, X. Ke, B. Qian, J. Hu, D. Fobes, E. K. Vehstedt, H. Pham, J. H. Yang, M. H. Fang, L. Spinu, P. Schiffer, Y. Liu, and Z. Q. Mao 2009-11-09T00:00:00-05:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevB.80.174509 Phys. Rev. B 80, 174509 text/html article Physical Review B 80 17 2009-11-09T00:00:00-05:00 174509 Superfluidity and superconductivity Superfluidity and superconductivity http://link.aps.org/doi/10.1103/PhysRevB.80.174510 Author(s): M. Yi, D. H. Lu, J. G. Analytis, J.-H. Chu, S.-K. Mo, R.-H. He, M. Hashimoto, R. G. Moore, I. I. Mazin, D. J. Singh, Z. Hussain, I. R. Fisher, and Z.-X. Shen<br/>Through a systematic high-resolution angle-resolved photoemission study of the iron pnictide compounds (Ba,Sr)Fe_{2} As_{2} , we show that the electronic structures of these compounds are significantly reconstructed across the spin density wave transition, which cannot be described by a simple foldi...<br/><img src="http://prb.aps.org/files/SuggestionPRB30x30.jpg" alt="PRB Editors' Suggestion"/><br/> [Phys. Rev. B 80, 174510] Published Mon Nov 09, 2009 M. Yi, D. H. Lu, J. G. Analytis, J.-H. Chu, S.-K. Mo, R.-H. He, M. Hashimoto, R. G. Moore, I. I. Mazin, D. J. Singh, Z. Hussain, I. R. Fisher, and Z.-X. Shen 2009-11-09T00:00:00-05:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevB.80.174510 Phys. Rev. B 80, 174510 text/html article Physical Review B 80 17 2009-11-09T00:00:00-05:00 174510 Superfluidity and superconductivity Superfluidity and superconductivity http://link.aps.org/doi/10.1103/PhysRevB.80.184409 Author(s): Hiroto Ohta and Kazuyoshi Yoshimura<br/>We synthesized a series of CoAs based weakly itinerant ferromagnetic compound LCoAsO ( L : lanthanoids) and systematically studied a L dependence on magnetic properties. Lattice constants a and c decrease monotonically with the decrease in the ion size of L^{3+} . In the cases of L=Nd , Sm, and Gd, ...<br/>[Phys. Rev. B 80, 184409] Published Mon Nov 09, 2009 Hiroto Ohta and Kazuyoshi Yoshimura 2009-11-09T00:00:00-05:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevB.80.184409 Phys. Rev. B 80, 184409 text/html article Physical Review B 80 18 2009-11-09T00:00:00-05:00 184409 Magnetism Magnetism http://link.aps.org/doi/10.1103/PhysRevB.80.184502 Author(s): S. Sharma, S. Shallcross, J. K. Dewhurst, A. Sanna, C. Bersier, S. Massidda, and E. K. U. Gross<br/>Using state-of-the-art first-principles calculations we study the magnetic behavior of CeOFeAs. We find the Ce layer moments oriented perpendicular to those of the Fe layers. An analysis of incommensurate magnetic structures reveals that the Ce-Ce magnetic coupling is rather weak with, however, a st...<br/>[Phys. Rev. B 80, 184502] Published Wed Nov 04, 2009 S. Sharma, S. Shallcross, J. K. Dewhurst, A. Sanna, C. Bersier, S. Massidda, and E. K. U. Gross 2009-11-04T00:00:00-05:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevB.80.184502 Phys. Rev. B 80, 184502 text/html article Physical Review B 80 18 2009-11-04T00:00:00-05:00 184502 Superfluidity and superconductivity Superfluidity and superconductivity http://link.aps.org/doi/10.1103/PhysRevB.80.174401 Author(s): P. M. R. Brydon and C. Timm<br/>Motivated by the iron pnictides, we examine the spin excitations in an itinerant antiferromagnet where a spin-density wave (SDW) originates from an excitonic instability of nested electronlike and holelike Fermi pockets. Using the random-phase approximation, we derive the Dyson equation for the tran...<br/>[Phys. Rev. B 80, 174401] Published Tue Nov 03, 2009 P. M. R. Brydon and C. Timm 2009-11-03T00:00:00-05:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevB.80.174401 Phys. Rev. B 80, 174401 text/html article Physical Review B 80 17 2009-11-03T00:00:00-05:00 174401 Magnetism Magnetism http://link.aps.org/doi/10.1103/PhysRevB.80.180502 Author(s): A. Akrap, J. J. Tu, L. J. Li, G. H. Cao, Z. A. Xu, and C. C. Homes<br/>The detailed optical properties of BaFe_{2} As_{2} have been determined over a wide frequency range above and below the structural and magnetic transition at T_{N} ≃138 K . A prominent in-plane infrared-active mode is observed at 253 cm^{−1} (31.4 meV) at 295 K. The frequency of this vibrati...<br/><img src="http://prb.aps.org/files/SuggestionPRB30x30.jpg" alt="PRB Editors' Suggestion"/><br/> <img src="http://prola.aps.org/graphics/rapid30x30.gif" width="30" height="30" alt="Rapid Communication"/><br/>[Phys. Rev. B 80, 180502] Published Mon Nov 02, 2009 A. Akrap, J. J. Tu, L. J. Li, G. H. Cao, Z. A. Xu, and C. C. Homes 2009-11-02T00:00:00-05:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevB.80.180502 Phys. Rev. B 80, 180502 text/html article Physical Review B 80 18 2009-11-02T00:00:00-05:00 180502 Superfluidity and superconductivity Superfluidity and superconductivity http://link.aps.org/doi/10.1103/PhysRevB.80.184501 Author(s): Guangtao Wang, Minping Zhang, Lihua Zheng, and Zongxian Yang<br/>Inspired by the experience in CuO-based superconductor that larger spacing distance between CuO planes induced higher superconductivity transition temperature (T_{C} ) , some researchers synthesized (Sr_{2} ScO_{3} )_{2} Fe_{2} As_{2} and (Sr_{2} VO_{3} )_{2} Fe_{2} As_{2} with the spacing distance ...<br/>[Phys. Rev. B 80, 184501] Published Mon Nov 02, 2009 Guangtao Wang, Minping Zhang, Lihua Zheng, and Zongxian Yang 2009-11-02T00:00:00-05:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevB.80.184501 Phys. Rev. B 80, 184501 text/html article Physical Review B 80 18 2009-11-02T00:00:00-05:00 184501 Superfluidity and superconductivity Superfluidity and superconductivity http://link.aps.org/doi/10.1103/PhysRevB.80.140515 Author(s): A. V. Chubukov, M. G. Vavilov, and A. B. Vorontsov<br/>Using general symmetry arguments and model calculations we analyze the superconducting gap in materials with multiple Fermi-surface pockets, with applications to iron pnictides. We show that the gap in the pnictides has an extended s -wave symmetry but is either nodeless or has nodes, depending on t...<br/><img src="http://prb.aps.org/files/SuggestionPRB30x30.jpg" alt="PRB Editors' Suggestion"/><br/> <img src="http://prola.aps.org/graphics/rapid30x30.gif" width="30" height="30" alt="Rapid Communication"/><br/>[Phys. Rev. B 80, 140515] Published Thu Oct 29, 2009 A. V. Chubukov, M. G. Vavilov, and A. B. Vorontsov 2009-10-29T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevB.80.140515 Phys. Rev. B 80, 140515 text/html article Physical Review B 80 14 2009-10-29T00:00:00-04:00 140515 Superfluidity and superconductivity Superfluidity and superconductivity http://link.aps.org/doi/10.1103/PhysRevB.80.144524 Author(s): Neeraj Kumar, Songxue Chi, Ying Chen, Kumari Gaurav Rana, A. K. Nigam, A. Thamizhavel, William Ratcliff, II, S. K. Dhar, and Jeffrey W. Lynn<br/>Magnetization, susceptibility, specific heat, resistivity, neutron and x-ray diffraction have been used to characterize the properties of single-crystalline CaFe_{2−x} Ni_{x} As_{2} as a function of Ni doping for x varying from 0 to 0.1. The combined first-order structural and magnetic phase trans...<br/>[Phys. Rev. B 80, 144524] Published Thu Oct 29, 2009 Neeraj Kumar, Songxue Chi, Ying Chen, Kumari Gaurav Rana, A. K. Nigam, A. Thamizhavel, William Ratcliff, II, S. K. Dhar, and Jeffrey W. Lynn 2009-10-29T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevB.80.144524 Phys. Rev. B 80, 144524 text/html article Physical Review B 80 14 2009-10-29T00:00:00-04:00 144524 Superfluidity and superconductivity Superfluidity and superconductivity http://link.aps.org/doi/10.1103/PhysRevB.80.134523 Author(s): S. L. Bud’ko, P. C. Canfield, A. S. Sefat, B. C. Sales, M. A. McGuire, and D. Mandrus<br/>Heat capacity and anisotropic thermal expansion was measured for Fe_{1.06} Te and FeTe_{0.5} Se_{0.5} single crystals. Previously reported phase transitions are clearly seen in both measurements. In both cases the thermal expansion is anisotropic. The uniaxial pressure derivatives of the superconduc...<br/>[Phys. Rev. B 80, 134523] Published Wed Oct 28, 2009 S. L. Bud’ko, P. C. Canfield, A. S. Sefat, B. C. Sales, M. A. McGuire, and D. Mandrus 2009-10-28T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevB.80.134523 Phys. Rev. B 80, 134523 text/html article Physical Review B 80 13 2009-10-28T00:00:00-04:00 134523 Superfluidity and superconductivity Superfluidity and superconductivity http://link.aps.org/doi/10.1103/PhysRevLett.103.186402 Author(s): Degang Zhang<br/>The energy band structure of FeAs-based superconductors is fitted by a tight-binding model with two Fe ions per unit cell and two degenerate orbitals per Fe ion. Based on this, superconductivity with extended s-wave pairing symmetry of the form cos⁡k_{x} +cos⁡k_{y} is examined. The local density...<br/>[Phys. Rev. Lett. 103, 186402] Published Mon Oct 26, 2009 Degang Zhang 2009-10-26T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevLett.103.186402 Phys. Rev. Lett. 103, 186402 text/html article Physical Review Letters 103 18 2009-10-26T00:00:00-04:00 186402 Condensed Matter: Electronic Properties, etc. Condensed Matter: Electronic Properties, etc. http://link.aps.org/doi/10.1103/PhysRevB.80.140511 Author(s): R. Khasanov, M. Bendele, A. Amato, P. Babkevich, A. T. Boothroyd, A. Cervellino, K. Conder, S. N. Gvasaliya, H. Keller, H.-H. Klauss, H. Luetkens, V. Pomjakushin, E. Pomjakushina, and B. Roessli<br/>We have studied the superconducting and magnetic properties of Fe_{1+y} Se_{x} Te_{1−x} single crystals (0≤x≤0.5) by magnetic susceptibility, muon-spin rotation, and neutron diffraction. We find three regimes of behavior: (i) commensurate magnetic order for x≲0.1 , (ii) bulk superconductivit...<br/><img src="http://prb.aps.org/files/SuggestionPRB30x30.jpg" alt="PRB Editors' Suggestion"/><br/> <img src="http://prola.aps.org/graphics/rapid30x30.gif" width="30" height="30" alt="Rapid Communication"/><br/>[Phys. Rev. B 80, 140511] Published Mon Oct 26, 2009 R. Khasanov, M. Bendele, A. Amato, P. Babkevich, A. T. Boothroyd, A. Cervellino, K. Conder, S. N. Gvasaliya, H. Keller, H.-H. Klauss, H. Luetkens, V. Pomjakushin, E. Pomjakushina, and B. Roessli 2009-10-26T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevB.80.140511 Phys. Rev. B 80, 140511 text/html article Physical Review B 80 14 2009-10-26T00:00:00-04:00 140511 Superfluidity and superconductivity Superfluidity and superconductivity http://link.aps.org/doi/10.1103/PhysRevB.80.140512 Author(s): D. J. Scalapino and T. P. Devereaux<br/>Calculations of the pairing interaction in multiband models of the Fe superconductors show that it is attractive in both the A_{1g} ( s -wave) and B_{1g} ( d -wave) channels. This raises the possibility that these materials may have collective excitonic modes. Here, assuming an s -wave ground state,...<br/><img src="http://prb.aps.org/files/SuggestionPRB30x30.jpg" alt="PRB Editors' Suggestion"/><br/> <img src="http://prola.aps.org/graphics/rapid30x30.gif" width="30" height="30" alt="Rapid Communication"/><br/>[Phys. Rev. B 80, 140512] Published Mon Oct 26, 2009 D. J. Scalapino and T. P. Devereaux 2009-10-26T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevB.80.140512 Phys. Rev. B 80, 140512 text/html article Physical Review B 80 14 2009-10-26T00:00:00-04:00 140512 Superfluidity and superconductivity Superfluidity and superconductivity http://link.aps.org/doi/10.1103/PhysRevB.80.134519 Author(s): Guodong Liu, Haiyun Liu, Lin Zhao, Wentao Zhang, Xiaowen Jia, Jianqiao Meng, Xiaoli Dong, Jun Zhang, G. F. Chen, Guiling Wang, Yong Zhou, Yong Zhu, Xiaoyang Wang, Zuyan Xu, Chuangtian Chen, and X. J. Zhou<br/>High-resolution angle-resolved photoemission measurements have been carried out on BaFe_{2} As_{2} , a parent compound of the FeAs-based superconductors. In the magnetic ordering state, there is no gap opening observed on the Fermi surface. Instead, dramatic band-structure reorganization occurs acro...<br/>[Phys. Rev. B 80, 134519] Published Fri Oct 23, 2009 Guodong Liu, Haiyun Liu, Lin Zhao, Wentao Zhang, Xiaowen Jia, Jianqiao Meng, Xiaoli Dong, Jun Zhang, G. F. Chen, Guiling Wang, Yong Zhou, Yong Zhu, Xiaoyang Wang, Zuyan Xu, Chuangtian Chen, and X. J. Zhou 2009-10-23T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevB.80.134519 Phys. Rev. B 80, 134519 text/html article Physical Review B 80 13 2009-10-23T00:00:00-04:00 134519 Superfluidity and superconductivity Superfluidity and superconductivity http://link.aps.org/doi/10.1103/PhysRevB.80.144522 Author(s): Z. P. Yin and W. E. Pickett<br/>Superconductivity arises in the layered iron-pnictide compounds when magnetic long-range order disappears. We use first-principles density-functional methods to study magnetic arrangements that may compete with long-range order near the phase boundary. Specifically, we study the energetics and charg...<br/>[Phys. Rev. B 80, 144522] Published Thu Oct 22, 2009 Z. P. Yin and W. E. Pickett 2009-10-22T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevB.80.144522 Phys. Rev. B 80, 144522 text/html article Physical Review B 80 14 2009-10-22T00:00:00-04:00 144522 Superfluidity and superconductivity Superfluidity and superconductivity http://link.aps.org/doi/10.1103/PhysRevLett.103.177001 Author(s): Seiichiro Onari and Hiroshi Kontani<br/>Based on the five-orbital model, we study the effect of local impurity in iron pnictides, and find that the interband impurity scattering is promoted by the d-orbital degree of freedom. This fact means that the fully gapped sign-reversing s-wave state, which is predicted by spin fluctuation theories...<br/>[Phys. Rev. Lett. 103, 177001] Published Wed Oct 21, 2009 Seiichiro Onari and Hiroshi Kontani 2009-10-21T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevLett.103.177001 Phys. Rev. Lett. 103, 177001 text/html article Physical Review Letters 103 17 2009-10-21T00:00:00-04:00 177001 Condensed Matter: Electronic Properties, etc. Condensed Matter: Electronic Properties, etc. http://link.aps.org/doi/10.1103/PhysRevB.80.144519 Author(s): Chao Zhang, Wei Yi, Liling Sun, Xiao-Jia Chen, Russell J. Hemley, Ho-kwang Mao, Wei Lu, Xiaoli Dong, Ligang Bai, Jing Liu, Antonio F. Moreira Dos Santos, Jamie J. Molaison, Christopher A. Tulk, Genfu Chen, Nanlin Wang, and Zhongxian Zhao<br/>Pressure-induced lattice collapse was discovered in tetragonal (T) phase of single crystal Fe_{1.05} Te at room temperature through x-ray and neutron-diffraction measurements. A remarkable compression along the c axis (∼5%) was observed upon increasing pressure from the ambient condition to 4 GPa....<br/>[Phys. Rev. B 80, 144519] Published Wed Oct 21, 2009 Chao Zhang, Wei Yi, Liling Sun, Xiao-Jia Chen, Russell J. Hemley, Ho-kwang Mao, Wei Lu, Xiaoli Dong, Ligang Bai, Jing Liu, Antonio F. Moreira Dos Santos, Jamie J. Molaison, Christopher A. Tulk, Genfu Chen, Nanlin Wang, and Zhongxian Zhao 2009-10-21T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevB.80.144519 Phys. Rev. B 80, 144519 text/html article Physical Review B 80 14 2009-10-21T00:00:00-04:00 144519 Superfluidity and superconductivity Superfluidity and superconductivity http://link.aps.org/doi/10.1103/PhysRevB.80.140508 Author(s): Lei Fang, Huiqian Luo, Peng Cheng, Zhaosheng Wang, Ying Jia, Gang Mu, Bing Shen, I. I. Mazin, Lei Shan, Cong Ren, and Hai-Hu Wen<br/>We report a systematic investigation, together with a theoretical analysis, of the resistivity and Hall effect in single crystals of Ba(Fe_{1−x} Co_{x} )_{2} As_{2} over a wide doping range. We find a surprisingly great disparity between the relaxation rates of the holes and the electrons in exces...<br/><img src="http://prola.aps.org/graphics/rapid30x30.gif" width="30" height="30" alt="Rapid Communication"/><br/>[Phys. Rev. B 80, 140508] Published Fri Oct 16, 2009 Lei Fang, Huiqian Luo, Peng Cheng, Zhaosheng Wang, Ying Jia, Gang Mu, Bing Shen, I. I. Mazin, Lei Shan, Cong Ren, and Hai-Hu Wen 2009-10-16T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevB.80.140508 Phys. Rev. B 80, 140508 text/html article Physical Review B 80 14 2009-10-16T00:00:00-04:00 140508 Superfluidity and superconductivity Superfluidity and superconductivity http://link.aps.org/doi/10.1103/PhysRevB.80.144517 Author(s): C. R. Rotundu, D. T. Keane, B. Freelon, S. D. Wilson, A. Kim, P. N. Valdivia, E. Bourret-Courchesne, and R. J. Birgeneau<br/>The electronic phase diagram of PrFeAsO_{1−x} F_{x} (0≤x≤0.225) has been determined using synchrotron x-ray powder-diffraction, magnetization, and resistivity measurements. The structural transition temperature is suppressed from 154 to ≈120 K and the magnetic phase transitions of both iro...<br/>[Phys. Rev. B 80, 144517] Published Thu Oct 15, 2009 C. R. Rotundu, D. T. Keane, B. Freelon, S. D. Wilson, A. Kim, P. N. Valdivia, E. Bourret-Courchesne, and R. J. Birgeneau 2009-10-15T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevB.80.144517 Phys. Rev. B 80, 144517 text/html article Physical Review B 80 14 2009-10-15T00:00:00-04:00 144517 Superfluidity and superconductivity Superfluidity and superconductivity http://link.aps.org/doi/10.1103/PhysRevB.80.134411 Author(s): Javier Herrero-Martín, Valerio Scagnoli, Claudio Mazzoli, Yixi Su, Ranjan Mittal, Yinguo Xiao, Thomas Brueckel, Neeraj Kumar, S. K. Dhar, A. Thamizhavel, and Luigi Paolasini<br/>Magnetic resonant x-ray scattering experiments have been performed on a single crystal of EuFe_{2} As_{2} at the Eu L_{3} absorption edge. The orientation of Eu magnetic moments was directly determined: in the antiferromagnetic (AFM) ordered phase they lay parallel to the crystallographic a axis. ...<br/>[Phys. Rev. B 80, 134411] Published Tue Oct 13, 2009 Javier Herrero-Martín, Valerio Scagnoli, Claudio Mazzoli, Yixi Su, Ranjan Mittal, Yinguo Xiao, Thomas Brueckel, Neeraj Kumar, S. K. Dhar, A. Thamizhavel, and Luigi Paolasini 2009-10-13T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevB.80.134411 Phys. Rev. B 80, 134411 text/html article Physical Review B 80 13 2009-10-13T00:00:00-04:00 134411 Magnetism Magnetism http://link.aps.org/doi/10.1103/PhysRevB.80.144516 Author(s): R. H. Liu, D. Tan, Y. A. Song, Q. J. Li, Y. J. Yan, J. J. Ying, Y. L. Xie, X. F. Wang, and X. H. Chen<br/>The compounds Na_{2} Ti_{2} P_{2} O (P=As,Sb) with anti- K_{2} NiF_{4} structure were characterized by magnetic susceptibility, magnetoresistance, Hall coefficient (R_{H} ) , heat capacity, and thermoelectric power (TEP). These compounds exhibit an anomalous transition in resistivity and susceptibil...<br/>[Phys. Rev. B 80, 144516] Published Tue Oct 13, 2009 R. H. Liu, D. Tan, Y. A. Song, Q. J. Li, Y. J. Yan, J. J. Ying, Y. L. Xie, X. F. Wang, and X. H. Chen 2009-10-13T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevB.80.144516 Phys. Rev. B 80, 144516 text/html article Physical Review B 80 14 2009-10-13T00:00:00-04:00 144516 Superfluidity and superconductivity Superfluidity and superconductivity http://link.aps.org/doi/10.1103/PhysRevB.80.144515 Author(s): D. L. Sun, Y. Liu, and C. T. Lin<br/>A comparative study of the upper critical field H_{c2} and second magnetization peak H_{sp} was performed using high-quality single crystals of hole-doped Ba_{0.68} K_{0.32} Fe_{2} As_{2} and electron-doped BaFe_{1.85} Co_{0.15} As_{2} and BaFe_{1.91} Ni_{0.09} As_{2} . The H_{c2} was extracted from...<br/>[Phys. Rev. B 80, 144515] Published Mon Oct 12, 2009 D. L. Sun, Y. Liu, and C. T. Lin 2009-10-12T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevB.80.144515 Phys. Rev. B 80, 144515 text/html article Physical Review B 80 14 2009-10-12T00:00:00-04:00 144515 Superfluidity and superconductivity Superfluidity and superconductivity