447 citations · 1.2k across the 19 of their papers we have counts for
19 papers
High-field fate of the Kitaev quantum spin liquid in -RuCl
K. Imamura, R. Ohno, Y. C. Tsuzuki +15
Kitaev quantum spin liquids (KQSLs) host fractionalized excitations described by itinerant Majorana quasiparticles and gapped fluxes (visons), providing a platform for emerge…
Defect-Induced Low-Energy Majorana Excitations in the Kitaev Magnet -RuCl
K. Imamura, Y. Mizukami, O. Tanaka +8
The excitations in the Kitaev spin liquid (KSL) can be described by Majorana fermions, which have characteristic field dependence of bulk gap and topological edge modes. In the hig…
Majorana-fermion origin of the planar thermal Hall effect in the Kitaev magnet -RuCl
K. Imamura, S. Suetsugu, Y. Mizukami +11
The field-induced quantum disordered state of layered honeycomb magnet -RuCl is a prime candidate for Kitaev spin liquids hosting Majorana fermions and non-Abelian anyons. R…
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…
Pure nematic quantum critical point accompanied by a superconducting dome
K. Ishida, Y. Onishi, M. Tsujii +8
When a symmetry-breaking phase of matter is suppressed to a quantum critical point (QCP) at absolute zero, quantum-mechanical fluctuations proliferate. Such fluctuations can lead t…
Tuning the Parity Mixing of Singlet-Septet Pairing in a Half-Heusler Superconductor
K. Ishihara, T. Takenaka, Y. Miao +12
In superconductors, electrons with spin form Cooper pairs whose spin structure is usually singlet () or triplet (). When the electronic structure near the F…
Thermodynamic Signatures of Diagonal Nematicity in RbFeAs Superconductor
Y. Mizukami, O. Tanaka, K. Ishida +10
Electronic nematic states with broken rotational symmetry often emerge in correlated materials. In most iron-based superconductors, the nematic anisotropy is oriented in the Fe-Fe…
Pressure-induced reconstitution of Fermi surfaces and spin fluctuations in S-substituted FeSe
T. Kuwayama, K. Matsuura, J. Gouchi +8
FeSe is a unique high- iron-based superconductor in which nematicity, superconductivity, and magnetism are entangled with each other in the - phase diagram. We performed…
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…
Emergent XY electronic nematicity in iron-based superconductors
K. Ishida, M. Tsujii, S. Hosoi +9
Electronic nematicity, a correlated state that spontaneously breaks rotational symmetry, is observed in several layered quantum materials. In contrast to their liquid-crystal count…
Two different superconducting states and possible antiferromagnetic quantum critical points in S-doped FeSe under pressure
T. Kuwayama, K. Matsuura, Y. Mizukami +5
We performed Se-NMR measurements on FeSeS, ( = 0.12) up to 3.0 GPa at an applied magnetic field of 6.02 T, and found that the superconducting (SC) phase exhib…
Diagonal Nematicity in the Pseudogap Phase of HgBaCuO
H. Murayama, Y. Sato, R. Kurihara +11
The pseudogap phenomenon in cuprates is the most mysterious puzzle in the research of high-temperature superconductivity. In particular, whether the pseudogap is associated with a…
Full-gap superconductivity robust against disorder in heavy-fermion CeCu2Si2
T. Takenaka, Y. Mizukami, J. A. Wilcox +9
A key aspect of unconventional pairing by the antiferromagnetic spin-fluctuation mechanism is that the superconducting energy gap must have opposite sign on different parts of the…
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…
Direct observation of lattice symmetry breaking at the hidden-order transition in URu2Si2
S. Tonegawa, S. Kasahara, T. Fukuda +12
Since the 1985 discovery of the phase transition at K in the heavy-fermion metal URuSi, neither symmetry change in the crystal structure nor magnetic orde…
Superconducting gap with sign reversal between hole pockets in heavily hole-doped Ba1-xKxFe2As2
D. Watanabe, T. Yamashita, Y. Kawamoto +16
To gain insight into the unconventional superconductivity of Fe-pnictides with no electron pockets, we measure the thermal conductivity and penetration depth in the heavily…
Quasiparticle mass enhancement close to the quantum critical point in BaFe(AsP)
P. Walmsley, C. Putzke, L. Malone +11
We report a combined study of the specific heat and de Haas-van Alphen effect in the iron-pnictide superconductor BaFe(AsP). Our data when combined with results…
Strong suppression of superconductivity by divalent Ytterbium Kondo-holes in CeCoIn_5
M. Shimozawa, T. Watashige, S. Yasumoto +7
To study the nature of partially substituted Yb-ions in a Ce-based Kondo lattice, we fabricated high quality Ce_{1-x}Yb_xCoIn_5 epitaxial thin films using molecular beam epitaxy. W…
Nematic and meta-nematic transitions in the iron pnictides
S. Kasahara, H. J. Shi, K. Hashimoto +8
Strongly interacting electrons can exhibit novel collective phases, among which the electronic nematic phases are perhaps the most surprising as they spontaneously break rotational…