393 citations · 1.6k across the 33 of their papers we have counts for
33 papers
Three-dimensional spin susceptibility in BaKFeAs: Out-of-plane modulation revealed by neutron spectroscopy and theoretical modeling
Naoki Murai, Katsuhiro Suzuki, Masamichi Nakajima +4
We present a combined experimental and theoretical investigation of the spin dynamics in the iron-based superconductor BaKFeAs. Time-of-flight inelastic n…
First-principles method justifying the Dieke diagram and beyond
Katsuhiro Suzuki, Takao Kotani, Kazunori Sato
We present a method to determine the model Hamiltonians to treat rare-earth multiplets in solids from the results of the quasiparticle self-consistent \textit{GW} (QSGW) method. We…
Low-temperature acanthite-like phase of CuS: A first-principles study on electronic and transport properties
Ho Ngoc Nam, Katsuhiro Suzuki, Tien Quang Nguyen +4
The mobility and disorder in the lattice of Cu atoms as liquid-like behavior is an important characteristic affecting the thermoelectric properties of CuS. In this study, usi…
Horizontal Line Nodes in Sr2RuO4 Proved by Spin Resonance
K. Iida, M. Kofu, K. Suzuki +11
We investigated the low-energy incommensurate (IC) magnetic fluctuations in SrRuO by the high-resolution inelastic neutron scattering measurements and random phase approxim…
Model construction and a possibility of cuprate-like pairing in a new d9 nickelate superconductor (Nd,Sr)NiO2
Hirofumi Sakakibara, Hidetomo Usui, Katsuhiro Suzuki +3
Effective models are constructed for a newly discovered superconductor (Nd,Sr)NiO2, which has been considered as a possible nickelate analogue of the cuprates owing to the d9 elect…
Spin gap and L modulated intensity at the low-energy incommensurate magnetic fluctuations in the superconducting state of Sr2RuO4
Kazuki Iida, Maiko Kofu, Katsuhiro Suzuki +11
Low-energy incommensurate (IC) magnetic fluctuations in the multiband superconductor SrRuO is investigated by high-resolution inelastic neutron scattering measurements and…
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…
Searching for gap zeros in Sr2RuO4 via field-angle-dependent specific-heat measurement
Shunichiro Kittaka, Shota Nakamura, Toshiro Sakakibara +9
The gap structure of SrRuO, which is a longstanding candidate for a chiral p-wave superconductor, has been investigated from the perspective of the dependence of its specif…
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…
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…
Upper critical field and quantum oscillations in tetragonal superconducting FeS
Taichi Terashima, Naoki Kikugawa, Hai Lin +6
The magnetoresistance and magnetic torque of FeS are measured in magnetic fields of up to 18 T down to a temperature of 0.03 K. The superconducting transition temperature is fo…
Observation of a Hidden Hole-Like Band Approaching the Fermi Level in K-Doped Iron Selenide Superconductor
Masanori Sunagawa, Kensei Terashima, Takahiro Hamada +16
One of the ultimate goals of the study of iron-based superconductors is to identify the common feature that produces the high critical temperature (Tc). In the early days, based on…
Theoretical study on the correlation between the spin fluctuation and in the isovalent-doped 1111 iron-based superconductors
Hayato Arai, Hidetomo Usui, Katsuhiro Suzuki +2
Motivated by recent experiments on isovalent-doped 1111 iron-based superconductors LaFeAsPOF and the theoretical study that followed, we investigate…
Origin of the non-monotonic variance of Tc in the 1111 iron based superconductors with isovalent doping
Hidetomo Usui, Katsuhiro Suzuki, Kazuhiko Kuroki
Motivated by recent experimental investigations of the isovalent doping iron-based superconductors LaFe(AsxP1-x)O1-yFy and NdFe(AsxP1-x)O1-yFy we theoretically study the correlatio…
Proximity to Fermi-surface topological change in superconducting LaO0.54F0.46BiS2
K. Terashima, J. Sonoyama, T. Wakita +16
The electronic structure of nearly optimally-doped novel superconductor LaOFBiS ( = 0.46) was investigated using angle-resolved photoemission spectroscopy…
Orbital mixture effect on the Fermi surface- correlation in the cuprate superconductors --- bilayer vs single layer
Hirofumi Sakakibara, Katsuhiro Suzuki, Hidetomo Usui +6
By constructing two-orbital models from first principles, we have obtained a systematic correlation between the Fermi surface warping and the evaluated …
Soft x-ray photoemission study of new BiS-layered superconductor LaOFBiS
Shinsuke Nagira, Junki Sonoyama, Takanori Wakita +16
We use core level and valence band soft x-ray photoemission spectroscopy (SXPES) to investigate electronic structure of new BiS layered superconductor LaOFBiS$_…
Model of the Electronic Structure of Electron-Doped Iron-Based Superconductors: Evidence for Enhanced Spin Fluctuations by Diagonal Electron Hopping
Katsuhiro Suzuki, Hidetomo Usui, Soshi Iimura +4
We present a theoretical understanding of the superconducting phase diagram of the electron-doped iron pnictides. We show that, besides the Fermi surface nesting, a peculiar motion…
Switching of intra-orbital spin excitations in electron-doped iron pnictide superconductors
Soshi Iimura, Satoru Matsuishi, Masashi Miyakawa +10
We investigate the doping dependence of the magnetic excitations in two-superconducting-dome-system LaFeAsO1-xDx. Using inelastic neutron scattering, spin fluctuations at different…
Understanding the re-entrant superconducting phase diagram of an iron-pnictide CaAlOFe(AsP)
Hidetomo Usui, Katsuhiro Suzuki, Kazuhiko Kuroki +4
Recently, a very rich phase diagram has been obtained for an iron-based superconductor Ca4Al2O6Fe2(As1-xPx)2. It has been revealed that nodeless (x=0) and nodal (x = 1) superconduc…
Robust spin fluctuations and pairing in the heavily electron doped iron-based superconductors
Katsuhiro Suzuki, Hidetomo Usui, Kazuhiko Kuroki +4
We theoretically study the spin fluctuation and superconductivity in La1111 and Sm1111 iron-based superconductors for a wide range of electron doping. When we take into account the…
Large Seebeck effect in the electron-doped FeAs driven by quasi one dimensional pudding-mold type band
Hidetomo Usui, Kazuhiko Kuroki, Seiya Nakano +2
We investigate the thermoelectric propeties of the electron-doped FeAs both experimentally and theoretically. Electrons are doped by partially substituting Se for As, which lea…