scholarly journals Three-dimensional Fermi surface and electron-phonon coupling in semimetallic 1T - TiTe2 studied by angle-resolved photoemission spectroscopy

2019 ◽  
Vol 99 (12) ◽  
Author(s):  
Xiao-Fang Tang ◽  
Yu-Xia Duan ◽  
Fan-Ying Wu ◽  
Shu-Yu Liu ◽  
Chen Zhang ◽  
...  
Keyword(s):  
Fermi Surface ◽  
Three Dimensional ◽  
Photoemission Spectroscopy ◽  
Phonon Coupling ◽  
Angle Resolved Photoemission Spectroscopy ◽  
Electron Phonon Coupling

Three-Dimensional Fermi-Surface Nesting in 1T-VSe2Studied by Angle-Resolved Photoemission Spectroscopy

2004 ◽  
Vol 73 (12) ◽  
pp. 3331-3334 ◽  
Author(s):  
Takafumi Sato ◽  
Kensei Terashima ◽  
Seigo Souma ◽  
Hiroaki Matsui ◽  
Takashi Takahashi ◽  
...  
Keyword(s):  
Fermi Surface ◽  
Three Dimensional ◽  
Photoemission Spectroscopy ◽  
Angle Resolved Photoemission Spectroscopy ◽  
Fermi Surface Nesting

scholarly journals Dichotomy of superconductivity between monolayer FeS and FeSe

2019 ◽  
Vol 116 (49) ◽  
pp. 24470-24474
Author(s):  
Koshin Shigekawa ◽  
Kosuke Nakayama ◽  
Masato Kuno ◽  
Giao N. Phan ◽  
Kenta Owada ◽  
...  
Keyword(s):  
Molecular Beam ◽  
Photoemission Spectroscopy ◽  
Phonon Coupling ◽  
Superconducting Layer ◽  
Iron Based Superconductors ◽  
Angle Resolved Photoemission Spectroscopy ◽  
Electron Phonon Coupling ◽  
Heavy Electron ◽  
Superconducting Pairing

The discovery of high-temperature (Tc) superconductivity in monolayer FeSe on SrTiO3 raised a fundamental question: Whether high Tc is commonly realized in monolayer iron-based superconductors. Tetragonal FeS is a key material to resolve this issue because bulk FeS is a superconductor with Tc comparable to that of isostructural FeSe. However, difficulty in synthesizing tetragonal monolayer FeS due to its metastable nature has hindered further investigations. Here we report elucidation of band structure of monolayer FeS on SrTiO3, enabled by a unique combination of in situ topotactic reaction and molecular-beam epitaxy. Our angle-resolved photoemission spectroscopy on FeS and FeSe revealed marked similarities in the electronic structure, such as heavy electron doping and interfacial electron–phonon coupling, both of which have been regarded as possible sources of high Tc in FeSe. However, surprisingly, high-Tc superconductivity is absent in monolayer FeS. This is linked to the weak superconducting pairing in electron-doped multilayer FeS in which the interfacial effects are absent. Our results strongly suggest that the cross-interface electron–phonon coupling enhances Tc only when it cooperates with the pairing interaction inherent to the superconducting layer. This finding provides a key insight to explore heterointerface high-Tc superconductors.

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