462 citations · 5.5k across the 78 of their papers we have counts for
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Impurity effect on Bogoliubov Fermi surfaces: Analysis based on iron-based superconductors
Tatsuya Miki, Hiroaki Ikeda, Shintaro Hoshino
The effect of impurities on a superconductor with Bogoliubov Fermi surfaces (BFSs) is studied using a realistic tight-binding model. Based on the band structure composed of -orb…
In-plane electronic anisotropy revealed by interlayer resistivity measurements on the iron-based superconductor parent compound CaFeAsF
Taichi Terashima, Hishiro T. Hirose, Yoshitaka Matsushita +5
Both cuprates and iron-based superconductors demonstrate nematicity, defined as the spontaneous breaking of rotational symmetry in electron systems. The nematic state can play a ro…
Monte Carlo study of cuprate superconductors in a four-band - model: Role of orbital degrees of freedom
Hiroshi Watanabe, Tomonori Shirakawa, Kazuhiro Seki +4
Understanding the complex phase diagram of cuprate superconductors is a long-standing challenging problem. Recent studies have shown that orbital degrees of freedom, both Cu …
Unified description of cuprate superconductors using four-band - model
Hiroshi Watanabe, Tomonori Shirakawa, Kazuhiro Seki +4
In the 35 years since the discovery of cuprate superconductors, we have not yet reached a unified understanding of their properties, including their material dependence of the supe…
Theoretical studies for identifying horizontal line nodes via angle-resolved density of states measurements ---Application to SrRuO---
Kazushige Machida, Koki Irie, Katsuhiro Suzuki +1
On the basis of the microscopic quasi-classical Eilenberger theory, we analyze the recent angle-resolved specific heat experiment carried out at low temperature for SrRuO…
Accurate determination of the Fermi surface of tetragonal FeS via quantum oscillation measurements and quasiparticle self-consistent \textit{GW} calculations
Taichi Terashima, Naoki Kikugawa, David Graf +9
We perform de Haas-van Alphen measurements and quasiparticle self-consistent \textit{GW} (QS\textit{GW}) calculations on FeS. The calculated Fermi surface (FS) consists of two hole…
Effect of electron correlations on spin excitation bandwidth in BaKFeAs as seen via time-of-flight inelastic neutron scattering
Naoki Murai, Katsuhiro Suzuki, Shin-ichiro Ideta +4
We use inelastic neutron scattering (INS) to investigate the effect of electron correlations on spin dynamics in the iron-based superconductor BaKFeAs…
Fermi surface with Dirac fermions in CaFeAsF determined via quantum oscillation measurements
Taichi Terashima, Hishiro T. Hirose, David Graf +6
Despite the fact that 1111-type iron arsenides hold the record transition temperature of iron-based superconductors, their electronic structures have not been studied much because…
Magnetic and superconducting properties of the heavy-fermion CeCoIn5 epitaxial film probed by nuclear quadrupole resonance
Takayoshi Yamanaka, Masaaki Shimozawa, Hiroaki Shishido +6
Since the progress in the fabrication techniques of thin-films of exotic materials such as strongly correlated heavy-fermion compounds, microscopic studies of the magnetic and elec…
Local nodal Cooper pairs in multiorbital systems
Kazumasa Hattori, Takuya Nomoto, Takashi Hotta +1
We show the emergence of a new class of superconductivity in multiorbital systems, focusing on non-Kramers f states. The Cooper pairs in this class of superconductivity mainly…
Charge/quadrupole fluctuations and gap anisotropy in BiS-based superconductors
Katsuhiro Suzuki, Hidetomo Usui, Kazuhiko Kuroki +1
Recent angle-resolved spectroscopy in BiS-based superconductors has indicated that the superconducting gap amplitude possesses remarkable anisotropy and/or a sign change on a s…
Fully gapped superconductivity with no sign change in the prototypical heavy-fermion CeCu2Si2
T. Yamashita, T. Takenaka, Y. Tokiwa +16
In exotic superconductors including high- copper-oxides, the interactions mediating electron Cooper-pairing are widely considered to have a magnetic rather than the convention…
Symmetry protected line nodes in non-symmorphic magnetic space groups: Applications to UCoGe and UPdAl
Takuya Nomoto, Hiroaki Ikeda
We present the group-thoretical classification of gap functions in superconductors coexisting with some magnetic order in non-symmorphic magnetic space groups. Based on the weak-co…
Thermodynamic study of gap structure and pair-breaking effect by magnetic field in the heavy-fermion superconductor CeCu2Si2
Shunichiro Kittaka, Yuya Aoki, Yasuyuki Shimura +7
This paper presents the results of specific-heat and magnetization measurements, in particular their field-orientation dependence, on the first discovered heavy-fermion superconduc…
Classification of multipole superconductivity in multi-orbital systems and its implications
Takuya Nomoto, Kazumasa Hattori, Hiroaki Ikeda
Motivated by a growing interest in multi-orbital superconductors with spin-orbit interactions, we perform the group-theoretical classification of various unconventional superconduc…
Exotic multi-gap structure in UPt unveiled by the first-priniciples analysis
Takuya Nomoto, Hiroaki Ikeda
A heavy-fermion superconductor UPt is a unique spin-triplet superconductor with multiple superconducting phases. Here we provide the first report on the first-principles analys…
Nodal gap detection through polar angle-resolved density of states measurements in uniaxial superconductors
Yasumasa Tsutsumi, Takuya Nomoto, Hiroaki Ikeda +1
We propose a spectroscopic method to identify the nodal gap structure in unconventional superconductors. This method best suits for locating the horizontal line node and for pinpoi…
Evidence for chiral d-wave superconductivity in URu2Si2 from the field-angle variation of its specific heat
Shunichiro Kittaka, Yusei Shimizu, Toshiro Sakakibara +7
Low-energy quasiparticle (QP) excitations in the heavy-fermion superconductor URuSi were investigated by specific-heat measurements of a high-quality single…
Evolution of quasiparticle excitations with critical mass enhancement in superconducting AFe2As2 (A = K, Rb, and Cs)
Y. Mizukami, Y. Kawamoto, Y. Shimoyama +8
In the heavily hole-doped iron-based superconductors FeAs ( K, Rb, and Cs), the electron effective mass increases rapidly with alkali-ion radius. To study how the ma…
Ab initio downfolding study of the iron-based ladder superconductor BaFeS
Ryotaro Arita, Hiroaki Ikeda, Shiro Sakai +1
Motivated by the recent discovery of superconductivity in the iron-based ladder compound BaFeS under high pressure, we derive low-energy effective Hamiltonians from first p…
Field-induced superconducting phase of FeSe in the BCS-BEC cross-over
S. Kasahara, T. Watashige, T. Hanaguri +13
Fermi systems in the crossover regime between weakly coupled Bardeen-Cooper-Schrieffer (BCS) and strongly coupled Bose-Einstein-condensate (BEC) limits are among the most fascinati…
Lifting of xz/yz orbital degeneracy at the structural transition in detwinned FeSe
T. Shimojima, Y. Suzuki, T. Sonobe +14
We study superconducting FeSe (Tc = 9 K) exhibiting the tetragonal-orthorhombic structural transition (Ts = 90 K) without any antiferromagnetic ordering, by utilizing angle-resolve…
Anomalous Fermi surface in FeSe seen by Shubnikov-de Haas oscillation measurements
Taichi Terashima, Naoki Kikugawa, Andhika Kiswandhi +15
We have observed Shubnikov-de Haas oscillations in FeSe. The Fermi surface deviates significantly from predictions of band-structure calculations and most likely consists of one el…
Multiband superconductivity with unexpected deficiency of nodal quasiparticles in CeCu2Si2
Shunichiro Kittaka, Yuya Aoki, Yasuyuki Shimura +6
Superconductivity in the heavy-fermion compound CeCu2Si2 is a prototypical example of Cooper pairs formed by strongly correlated electrons. For more than 30 years, it has been beli…