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Hidden antiferro-nematic order in Fe-based superconductor BaFeAs and NaFeAs above
Seiichiro Onari, Hiroshi Kontani
In several Fe-based superconductors, slight symmetry breaking occurs at , which is tens of Kelvin higher than the structural transition temperature . In this "hidde…
Doping effects on electronic states in electron-doped FeSe: Impact of self-energy and vertex corrections
Youichi Yamakawa, Seiichiro Onari, Hiroshi Kontani
The pairing glue of high- superconductivity in heavily electron-doped (e-doped) FeSe, in which hole-pockets are absent, has been an important unsolved problem. Here, we…
Emergence of strongly correlated electronic states driven by the Andreev bound state in d-wave superconductors
Shun Matsubara, Hiroshi Kontani
As the surface Andreev bound state (ABS) forms at the open () edge of a -wave superconductor, the local density of states (LDOS) increases. Therefore, a strong el…
Pressure-induced quantum critical point in a heavily hydrogen-doped iron-based superconductor LaFeAsO
Masayoshi Takeuchi, Naoki Fujiwara, Takanori Kuwayama +6
An iron-based superconductor LaFeAsOH (0 0.6) undergoes two antiferromagnetic (AF) phases upon H doping. We investigated the second AF phase (=0.6) usi…
Hexadecapole fluctuation mechanism for s-wave heavy fermion superconductor CeCu2Si2: Interplay between intra- and inter-orbital Cooper pairs
Rina Tazai, Hiroshi Kontani
In heavy-fermion superconductors, it is widely believed that the superconducting gap function has sign-reversal due to the strong electron correlation. However, recently discovered…
Multipole fluctuation theory for heavy fermion systems: Application to multipole orders in CeB6
Rina Tazai, Hiroshi Kontani
In heavy fermion systems, multipole degrees of freedom make possible the emergence of rich phenomena, such as hidden orders and superconductivities. However, many of them remain un…