101 citations · 294 across the 9 of their papers we have counts for
9 papers
Impact of charge-density-wave pattern on the superconducting gap in V-based kagome superconductors
T. Nagashima, K. Ishihara, Y. Yamakawa +12
Kagome metals VSb ( K, Rb, Cs) provide a compelling platform to explore the interplay between superconductivity (SC) and charge-density-wave (CDW) orders. While dist…
Impact of tiny Fermi pockets with extremely high mobility on the Hall anomaly in the kagome metal CsVSb
S. Liu, M. Roppongi, M. Kimata +8
The kagome metal CsVSb exhibits an unusual charge-density-wave (CDW) order, where the emergence of loop current order that breaks time-reversal symmetry (TRS) has been prop…
Topology meets time-reversal symmetry breaking in FeSeTe superconductor
M. Roppongi, Y. Cai, K. Ogawa +21
Time-reversal symmetry breaking (TRSB) in magnetic topological insulators induces a Dirac gap in the topological surface state (TSS), leading to exotic phenomena such as the quantu…
Lifting of gap nodes by disorder in ultranodal superconductor candidate FeSe1-xSx
T. Nagashima, K. Ishihara, K. Imamura +8
The observation of time-reversal symmetry breaking and large residual density of states in tetragonal FeSeS suggests a novel type of ultranodal superconducting state wi…
Microwave Hall measurements using a circularly polarized dielectric cavity
M. Roppongi, T. Arakawa, Y. Yoshino +6
We have developed a circularly polarized dielectric rutile (TiO) cavity with a high quality-factor that can generate circularly polarized microwaves from two orthogonal linearl…
Two superconducting states with broken time-reversal symmetry in FeSe1-xSx
K. Matsuura, M. Roppongi, M. Qiu +25
Iron-chalcogenide superconductors FeSeS possess unique electronic properties such as non-magnetic nematic order and its quantum critical point. The nature of supercondu…
Bulk evidence of anisotropic -wave pairing with no sign change in the kagome superconductor CsVSb
M. Roppongi, K. Ishihara, Y. Tanaka +12
The recently discovered kagome superconductors VSb ( = K, Rb, Cs) possess a unique band structure with van Hove singularities and Dirac dispersions, in which unusual…
Chiral superconductivity in UTe2 probed by anisotropic low-energy excitations
K. Ishihara, M. Roppongi, M. Kobayashi +5
Chiral spin-triplet superconductivity is a topologically nontrivial pairing state with broken time-reversal symmetry, which can host Majorana quasiparticles. The recently discovere…
Strongly correlated superconductivity in a copper-based metal-organic framework with a perfect kagome lattice
T. Takenaka, K. Ishihara, M. Roppongi +17
Metal-organic frameworks (MOFs), which are self-assemblies of metal ions and organic ligands, provide a tunable platform to search a new state of matter. A two-dimensional (2D) per…