1
|
Chen X, Dai P, Feng D, Xiang T, Zhang FC. Iron-based high transition temperature superconductors. Natl Sci Rev 2014. [DOI: 10.1093/nsr/nwu007] [Citation(s) in RCA: 148] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
In a superconductor electrons form pairs and electric transport becomes dissipation-less at low temperatures. Recently discovered iron-based superconductors have the highest superconducting transition temperature next to copper oxides. In this article, we review material aspects and physical properties of iron-based superconductors. We discuss the dependence of transition temperature on the crystal structure, the interplay between antiferromagnetism and superconductivity by examining neutron scattering experiments, and the electronic properties of these compounds obtained by angle-resolved photoemission spectroscopy in link with some results from scanning tunneling microscopy/spectroscopy measurements. Possible microscopic model for this class of compounds is discussed from a strong coupling point of view.
Collapse
Affiliation(s)
- Xianhui Chen
- Department of Physics, University of Science and Technology of China, Hefei, 230026, China
| | - Pengcheng Dai
- Department of Physics and Astronomy, Rice University, Houston, TX 77005, USA
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Donglai Feng
- Department of Physics, Fudan University, Shanghai 200433, China
| | - Tao Xiang
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- Collaborative Innovation Center of Quantum Matter, Beijing 100190, China
| | - Fu-Chun Zhang
- Department of Physics, Zhejiang University, Hangzhou, 310027, China
| |
Collapse
|
3
|
Tan S, Zhang Y, Xia M, Ye Z, Chen F, Xie X, Peng R, Xu D, Fan Q, Xu H, Jiang J, Zhang T, Lai X, Xiang T, Hu J, Xie B, Feng D. Interface-induced superconductivity and strain-dependent spin density waves in FeSe/SrTiO3 thin films. NATURE MATERIALS 2013; 12:634-640. [PMID: 23708327 DOI: 10.1038/nmat3654] [Citation(s) in RCA: 186] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2013] [Accepted: 04/12/2013] [Indexed: 06/02/2023]
Abstract
The record superconducting transition temperature (T(c)) for the iron-based high-temperature superconductors (Fe-HTS) has long been 56 K. Recently, in single-layer FeSe films grown on SrTiO3 substrates, indications of a new record of 65 K have been reported. Using in situ photoemission measurements, we substantiate the presence of spin density waves (SDWs) in FeSe films--a key ingredient of Fe-HTS that was missed in FeSe before--and we find that this weakens with increased thickness or reduced strain. We demonstrate that the superconductivity occurs when the electrons transferred from the oxygen-vacant substrate suppress the otherwise pronounced SDWs in single-layer FeSe. Beyond providing a comprehensive understanding of FeSe films and directions to further enhance its T(c), we map out the phase diagram of FeSe as a function of lattice constant, which contains all the essential physics of Fe-HTS. With the simplest structure, cleanest composition and single tuning parameter, monolayer FeSe is an ideal system for testing theories of Fe-HTS.
Collapse
Affiliation(s)
- Shiyong Tan
- State Key Laboratory of Surface Physics, Department of Physics, and Advanced Materials Laboratory, Fudan University, Shanghai 200433, China
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
5
|
Wu J, Phillips P. Magnon-mediated pairing and isotope effect in iron-based superconductors. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2011; 23:094203. [PMID: 21339556 DOI: 10.1088/0953-8984/23/9/094203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Within a minimal model for the iron-based superconductors in which itinerant electrons interact with a band of local moments, we derive a general conclusion for multiband superconductivity. In a multiband superconductor, due to the Adler theorem, the interband scattering dominates the intraband scattering at the long wavelength limit as long as both interactions are induced by the Goldstone boson (which is the magnon in our case) and the transferred momentum is non-zero. Such an interaction leads to a well known sign-reversing superconductivity even if the interband and intraband interaction are repulsive. This effect can be modeled as arising from an internal Josephson link between the Fermi surface sheets. Our model is also consistent with the recently discovered coexistence of superconductivity and magnetic order in iron-pnictides. Although the experimentally observed isotope effect is large, α = 0.4, we show that it is consistent with a non-phononic mechanism in which it is the isotope effects which result in a change in the lattice constant and, as a consequence, the zero-point motion of the Fe atoms.
Collapse
Affiliation(s)
- Jiansheng Wu
- Department of Physics and Astronomy, University of California, Irvine, CA 92697-4575, USA
| | | |
Collapse
|
6
|
He C, Zhang Y, Xie BP, Wang XF, Yang LX, Zhou B, Chen F, Arita M, Shimada K, Namatame H, Taniguchi M, Chen XH, Hu JP, Feng DL. Electronic-structure-driven magnetic and structure transitions in superconducting NaFeAs single crystals measured by angle-resolved photoemission spectroscopy. PHYSICAL REVIEW LETTERS 2010; 105:117002. [PMID: 20867599 DOI: 10.1103/physrevlett.105.117002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2010] [Revised: 06/14/2010] [Indexed: 05/29/2023]
Abstract
The electronic structure of NaFeAs is studied with angle-resolved photoemission spectroscopy on high quality single crystals. Large portions of the band structure start to shift around the structural transition temperature and smoothly evolve as the temperature lowers through the spin density wave transition. Moreover, band folding due to magnetic order emerges slightly above the structural transition. Our observation provides direct evidence that the structural and magnetic transitions share the same origin and could both be driven by the electronic structure reconstruction in Fe-based superconductors instead of Fermi surface nesting. We did not observe any sign of a gap in the superconducting state, which is likely related to weakened superconductivity in the presence of the spin density wave.
Collapse
Affiliation(s)
- C He
- State Key Laboratory of Surface Physics, Department of Physics, Fudan University, Shanghai 200433, People's Republic of China
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
7
|
Zajdel P, Hsieh PY, Rodriguez EE, Butch NP, Magill JD, Paglione J, Zavalij P, Suchomel MR, Green MA. Phase Separation and Suppression of the Structural and Magnetic Transitions in Superconducting Doped Iron Tellurides, Fe1+xTe1−ySy. J Am Chem Soc 2010; 132:13000-7. [PMID: 20806923 DOI: 10.1021/ja105279p] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Pawel Zajdel
- NIST Center for Neutron Research, NIST, 100 Bureau Drive, Gaithersburg, 20878 Maryland, Departments of Materials Science and Engineering, Center for Nanophysics and Advance Materials and Chemistry, University of Maryland, College Park, Maryland 20742, and Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439
| | - Ping-Yen Hsieh
- NIST Center for Neutron Research, NIST, 100 Bureau Drive, Gaithersburg, 20878 Maryland, Departments of Materials Science and Engineering, Center for Nanophysics and Advance Materials and Chemistry, University of Maryland, College Park, Maryland 20742, and Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439
| | - Efrain E. Rodriguez
- NIST Center for Neutron Research, NIST, 100 Bureau Drive, Gaithersburg, 20878 Maryland, Departments of Materials Science and Engineering, Center for Nanophysics and Advance Materials and Chemistry, University of Maryland, College Park, Maryland 20742, and Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439
| | - Nicholas P. Butch
- NIST Center for Neutron Research, NIST, 100 Bureau Drive, Gaithersburg, 20878 Maryland, Departments of Materials Science and Engineering, Center for Nanophysics and Advance Materials and Chemistry, University of Maryland, College Park, Maryland 20742, and Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439
| | - Jeff D. Magill
- NIST Center for Neutron Research, NIST, 100 Bureau Drive, Gaithersburg, 20878 Maryland, Departments of Materials Science and Engineering, Center for Nanophysics and Advance Materials and Chemistry, University of Maryland, College Park, Maryland 20742, and Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439
| | - Johnpierre Paglione
- NIST Center for Neutron Research, NIST, 100 Bureau Drive, Gaithersburg, 20878 Maryland, Departments of Materials Science and Engineering, Center for Nanophysics and Advance Materials and Chemistry, University of Maryland, College Park, Maryland 20742, and Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439
| | - Peter Zavalij
- NIST Center for Neutron Research, NIST, 100 Bureau Drive, Gaithersburg, 20878 Maryland, Departments of Materials Science and Engineering, Center for Nanophysics and Advance Materials and Chemistry, University of Maryland, College Park, Maryland 20742, and Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439
| | - Matthew R. Suchomel
- NIST Center for Neutron Research, NIST, 100 Bureau Drive, Gaithersburg, 20878 Maryland, Departments of Materials Science and Engineering, Center for Nanophysics and Advance Materials and Chemistry, University of Maryland, College Park, Maryland 20742, and Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439
| | - Mark A. Green
- NIST Center for Neutron Research, NIST, 100 Bureau Drive, Gaithersburg, 20878 Maryland, Departments of Materials Science and Engineering, Center for Nanophysics and Advance Materials and Chemistry, University of Maryland, College Park, Maryland 20742, and Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439
| |
Collapse
|
8
|
Sudayama T, Wakisaka Y, Takubo K, Morinaga R, Sato TJ, Arita M, Namatame H, Taniguchi M, Mizokawa T. Band structure of the heavily-electron-doped FeAs-based Ba(Fe,Co)2As2 superconductor suppresses antiferromagnetic correlations. PHYSICAL REVIEW LETTERS 2010; 104:177002. [PMID: 20482128 DOI: 10.1103/physrevlett.104.177002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2009] [Indexed: 05/29/2023]
Abstract
In the heavily-electron-doped regime of the Ba(Fe,Co)2As2 superconductor, three hole bands at the zone center are observed and two of them reach the Fermi level. The larger hole pocket at the zone center is apparently nested with the smaller electron pocket around the zone corner. However, the (pi,0) Fermi surface reconstruction reported for the hole-doped case is absent in the heavily-electron-doped case. This observation shows that the apparent Fermi surface nesting alone is not enough to enhance the antiferromagnetic correlation as well as the superconducting transition temperature.
Collapse
Affiliation(s)
- T Sudayama
- Department of Physics and Department of Complexity Science and Engineering, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan
| | | | | | | | | | | | | | | | | |
Collapse
|
9
|
Shimojima T, Ishizaka K, Ishida Y, Katayama N, Ohgushi K, Kiss T, Okawa M, Togashi T, Wang XY, Chen CT, Watanabe S, Kadota R, Oguchi T, Chainani A, Shin S. Orbital-dependent modifications of electronic structure across the magnetostructural transition in BaFe2As2. PHYSICAL REVIEW LETTERS 2010; 104:057002. [PMID: 20366786 DOI: 10.1103/physrevlett.104.057002] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2009] [Indexed: 05/29/2023]
Abstract
Laser angle-resolved photoemission spectroscopy (ARPES) is employed to investigate the temperature (T) dependence of the electronic structure in BaFe2As2 across the magnetostructural transition at T{N} approximately 140 K. A drastic transformation in Fermi surface (FS) shape across T{N} is observed, as expected by first-principles band calculations. Polarization-dependent ARPES and band calculations consistently indicate that the observed FSs at k{z} approximately pi in the low-T antiferromagnetic state are dominated by the Fe3d{zx} orbital, leading to the twofold electronic structure. These results indicate that magnetostructural transition in BaFe2As2 accompanies orbital-dependent modifications in the electronic structure.
Collapse
Affiliation(s)
- T Shimojima
- Institute for Solid State Physics (ISSP), University of Tokyo, Kashiwa, Chiba 277-8581, Japan.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|