Rev. Rev. Since the discovery of high T c iron-based superconductors in early 2008, more than 15,000 papers have been published as a result of intensive research. Lett. investigate bands along Γ-X in both FeSe and BaFe2As2 and find the flip of sign of the nematic order parameter along Γ-X. Charles Day is a senior editor at Physics Today. Liu et al., Phys. This paper describes the current status of iron-based superconductors (IBSC) covering most up-to-date research progress along with the some background research, focusing on materials (bulk and thin film) and pairing mechanism. Conventional superconductors operate only at extremely low temperatures, but certain iron-based materials discovered roughly a decade ago … Secondly, there was the interlayer coupling model, according to which a layered structure consisting of BCS-type (s-wave symmetry) superconductors can enhance the superconductivity by itself. For 22 years ceramic oxides of copper seemed to offer the only way to reach high-temperature superconductivity. This is confirmed by the strong renormalization of bandwidth from our ARPES measurement. Near Γ, the dxz hole band shifts up, while the dyz hole band top shifts down to below Ef. [3] H. Pfau et al., Phys. Therefore, investigations in momentum and orbital dependency are essential to understand these long-range orders in FeSCs. Neutron-scattering experiments probed the, Evidence for that point of view comes from, Identifying the pairing mediators in the Fe-based, The pairing symmetry consists of a phase and an amplitude, which is known as the, Theorists typically predict the pairing symmetry by starting with the, On the experimental front, the challenges are different. ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. Iron-based superconductors: Current status of materials and pairing mechanism. It has been observed by recent scanning tunneling spectroscopy measurement that the fraction of vortex cores having zero-bias peaks decreases with increasing magnetic field on the surface of FeTe x Se1− x . B. M. Rotter, M. Tegel, D. Johrendt, Phys. Understanding the relationship between different order parameters will provide clues for pairing symmetry. Lett. (Similar arguments can be made for iron-based superconductors but the different material properties allow a different pairing symmetry.) Maw-Kuen Wu was barred from working with arsenic by his home institution, the. Commun., 5:3711(2014). 110, 067003(2013) B 99, 035118(2019). To sign up for alerts, please log in first. Angle-Resolved Photoemission Spectroscopy. One of the central problems for FeSCs is the unconventional pairing mechanism for high-temperature superconductivity. Lett. Rev. Below Neel temperature, the spin-density-wave gap opens and saturates. We use cookies to help provide and enhance our service and tailor content and ads. 13. Selecting this option will search all publications across the Scitation platform, Selecting this option will search all publications for the Publisher/Society in context, The Journal of the Acoustical Society of America, Iron-based superconductors, seven years later, When condensed-matter physics became king, The quantum spin Hall effect and topological insulators, https://doi.org/10.1103/PhysRevLett.101.107006, https://doi.org/10.1103/PhysRevB.78.060505, https://doi.org/10.1016/j.ssc.2008.09.057, https://doi.org/10.1209/0295-5075/83/47001, https://doi.org/10.1103/PhysRevLett.102.147002, https://doi.org/10.1103/PhysRevLett.101.057003, https://doi.org/10.1088/0256-307X/25/6/080, https://doi.org/10.1103/PhysRevB.79.224511, Angle-resolved photoemission spectroscopy. 14. Lett. M. Yi et al. In the following, we summarize our experimental result that provides insights on many critical problems in FeSCs. Selecting this option will search the current publication in context. 123, 066402(2019) I. I.Mazin, D. J.Singh, M. D.Johannes, M. H.Du, Phys. The iron-based superconductor FeTe x Se1− x is one of the material candidates hosting Majorana vortex modes residing in the vortex cores. Article copyright remains as specified within the article. 6. Instrument for in-situ anisotropic strain. B 92, 235138(2015) (Adapted from K. Ishida, Y. Nakai, H. Hosono, The iron-containing plane is not flat; pnictogen (. These layers are formed by edge-sharing tetrahedrons, with Fe atoms at the tetrahedron centers and X atoms at the corners. comments Soc. Therefore, they proposed a competing picture of spin-density wave state and superconducting state. Orbital dependent correlation effect and electronic phase diagram in normal state in FeSCs, Reference Lett. K. Kuroki, H. Usui, S. Onari, R. Arita, H. Aoki, Phys. Rev. JETP, 12. Therefore, under tight binding approximation, this orbital configuration will lead to a multi-Fermi surface, where multiple bands around Fermi level with different symmetries all play important roles. This enables us to verify the orbital characteristic of bands and selectively trace part of them for evolutionary study.
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