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Bosonic Mode and Impurity-Scattering in Monolayer Fe(Te,Se) High-Temperature Superconductors.
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TLDR
It is suggested that the spin-excitation-like bosonic mode within a sign-reversing pairing plays an essential role in monolayer FeTe0.5Se 0.5/SrTiO3(001), and the crucial information for investigating the high-temperature superconductivity in interfacial iron selenides is offered.Abstract:
The electron pairing mechanism has always been one of the most challenging problems in high-temperature superconductors. Fe(Te,Se), as the superconductor with intrinsic topological property, may ho...read more
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Observation of topological superconductivity on the surface of iron-based superconductor
Peng Zhang,Koichiro Yaji,Takahiro Hashimoto,Yuichi Ota,Takeshi Kondo,Kozo Okazaki,Zhijun Wang,Jinsheng Wen,Genda Gu,Hong Ding,Shik Shin +10 more
TL;DR: In this paper, the surface of the iron-based superconductor FeTe0.55Se0.45 has been shown to be topologically superconducting, providing a simple and possibly high-temperature platform for realizing Majorana states.
Journal ArticleDOI
Emergent vortex Majorana zero mode in iron-based superconductors
Lingyuan Kong,Hong Ding +1 more
TL;DR: In this article, the authors focus on Fe(Te, Se) single crystal and introduce the original ideas and research progress of the new emerging "iron home" for Majorana zero modes in their vortex core.
Journal ArticleDOI
Observation of Superconducting Collective Modes from Competing Pairing Instabilities in Single‐Layer NbSe <sub>2</sub>
TL;DR: In this article , the existence of a soft collective mode in single-layer NbSe2 , observed as a characteristic resonance excitation in high-resolution tunneling spectra is reported.
Journal ArticleDOI
Surface morphology and electronic structure in stoichiometric superconductor CaKFe4As4 probed by scanning tunneling microscopy/spectroscopy
Xiaodong Yu,Zhongxu Wei,Zhanyi Zhao,Tao Xie,Chang Liu,Ge He,Qihong Chen,Lei Shan,Huiqian Luo,Qing Huan,Jie Yuan,Kui Jin +11 more
TL;DR: In this article, the surface morphology and electronic structure of CaKFe4As4 single crystal were systematically investigated based on scanning tunneling microscopy/spectroscopy, which showed various morphologies, such as atomically resolved 1×1, 1×2, and 1×3 lattices.
Journal ArticleDOI
Pair density wave state in a monolayer high-Tc iron-based superconductor
TL;DR: In this article , the existence of intrinsic pair density wave (PDW) order in high-temperature (high-Tc) cuprate superconductors has been observed using scanning tunnelling microscopy and spectroscopy.
References
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Journal ArticleDOI
Theory of Superconductivity
TL;DR: In this article, a theory of superconductivity is presented, based on the fact that the interaction between electrons resulting from virtual exchange of phonons is attractive when the energy difference between the electrons states involved is less than the phonon energy, and it is favorable to form a superconducting phase when this attractive interaction dominates the repulsive screened Coulomb interaction.
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Theory of dirty superconductors
TL;DR: In this article, a B.C.S. theory for very dirty superconductors is sketched, where elastic scattering from physical and chemical impurities is large compared with the energy gap.
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Unconventional Pairing Originating from the Disconnected Fermi Surfaces of Superconducting LaFeAsO 1-x F x
Kazuhiko Kuroki,Seiichiro Onari,Ryotaro Arita,Hidetomo Usui,Yukio Tanaka,Hiroshi Kontani,Hideo Aoki +6 more
TL;DR: It is concluded that the multiple spin-fluctuation modes arising from the nesting across the disconnected Fermi surfaces realize an extended s-wave Pairing, while d-wave pairing can also be another candidate.
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Impurity-induced states in conventional and unconventional superconductors
TL;DR: In this article, the authors provide a unified framework for describing quasi-localized states in the vicinity of impurity sites in conventional and unconventional superconductors and show that these fluctuations affect the density of states and are, strictly speaking, gapless in the presence of an arbitrarily small concentration of magnetic impurities.
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Gap symmetry and structure of Fe-based superconductors
TL;DR: In this paper, a spin fluctuation theory and the sign-changing s-wave symmetry of superconducting gap structures was proposed to account for the nonuniversality of the gap structures of FeNictide and chalcogenide superconductors.