138 citations · 491 across the 18 of their papers we have counts for
18 papers
Locally commensurate charge-density wave with three-unit-cell periodicity in YBCO
I. Vinograd, R. Zhou, M. Hirata +7
In order to identify the mechanism responsible for the formation of charge-density waves (CDW) in cuprate superconductors, it is important to understand which aspects of the CDW's…
Magnetic-Field Dependence of Novel Gap Behavior Related to the Quantum-Size Effect
Tomonori Okuno, Yuta Kinoshita, Satoshi Matsuzaki +6
Pt-NMR measurements of Pt nanoparticles with a mean diameter of 4.0 nm were performed in a high magnetic field of approximately T to investigate the low-temp…
Evidence for gradual evolution of low-energy fluctuations underlying the first-order structural and valence order in YbPd
R. Nakanishi, T. Fujii, Y. Nakai +6
The valence orders at K and K in the cubic compound YbPd have been investigated by Pd-nuclear magnetic resonance (NMR) measurements. Significant decreas…
Pseudogap Behavior of the Nuclear Spin-lattice Relaxation Rate in FeSe Probed by Se-NMR
Anlu Shi, Takeshi Arai, Shunsaku Kitagawa +7
We conducted Se-nuclear magnetic resonance studies of the iron-based superconductor FeSe in magnetic fields of 0.6 to 19 T to investigate the superconducting and normal-stat…
Spin susceptibility of charge ordered YBa2Cu3Oy across the upper critical field
R. Zhou, M. Hirata, T. Wu +9
The value of the upper critical field Hc2, a fundamental characteristic of the superconducting state, has been subject to strong controversy in high-Tc copper-oxides. Since the iss…
Anomalous Spin Correlations and Mass-Generating Excitonic Instability of Interacting Weyl Fermions
Michihiro Hirata, Kyohei Ishikawa, Genki Matsuno +5
Recent advances in the study of nodal Weyl fermions (WFs), quasi-relativistic massless particles, constitute a novel realm of quantum many-body phenomena. The Coulomb interaction i…
Observation of electronic bound states in charge-ordered YBaCuO
R. Zhou, M. Hirata, T. Wu +11
Observing how electronic states in solids react to a local symmetry breaking provides insight into their microscopic nature. A striking example is the formation of bound states whe…
Spin excitations in the quasi-two-dimensional charge-ordered insulator -(BEDT-TTF)I probed via C NMR
Kyohei Ishikawa, Michihiro Hirata, Dong Liu +3
The spin excitations from the nonmagnetic charge-ordered insulating state of -(BEDT-TTF)I at ambient pressure have been investigated by probing the static and low-freque…
Observation of an anisotropic Dirac cone reshaping and ferrimagnetic spin polarization in an organic conductor
Michihiro Hirata, Kyohei Ishikawa, Kazuya Miyagawa +6
The Coulomb interaction among massless Dirac fermions in graphene is unscreened around the isotropic Dirac points, causing a logarithmic velocity renormalization and a cone reshapi…
Cu-NMR study of oxygen disorder in ortho-II YBa2Cu3Oy
T. Wu, R. Zhou, M. Hirata +12
We show that 63Cu NMR spectra place strong constraints on both the nature and the concentration of oxygen defects in ortho-II YBa2Cu3Oy. Systematic deviation from ideal ortho-II or…
Electron Correlations in the Quasi-Two-Dimensional Organic Conductor -(BEDT-TTF)I investigated by C NMR
Michihiro Hirata, Kazuya Miyagawa, Kazushi Kanoda +1
We report a C-NMR study on the ambient-pressure metallic phase of the layered organic conductor -(BEDT-TTF)I [BEDT-TTF: bisethylenedithio-tetrathiafulvalene],…
C NMR Study on the Charge-Disproportionated Conducting State in the Quasi-Two-Dimensional Organic Conductor -(BEDT-TTF)I
Michihiro Hirata, Kyohei Ishikawa, Kazuya Miyagawa +1
The conducting state of the quasi-two-dimensional organic conductor, -(BEDT-TTF)I, at ambient pressure is investigated with C NMR measurements, which separate the…
NN coupling and two-pion photoproduction on the nucleon
M. Hirata, N. Katagiri, T. Takaki
Effects of non-resonant photoproductions arising from two different couplings are investigated in the reaction. We find that the pseudoscalar (PS) coupling i…
Nuclear Photoabsorption at Photon Energies between 300 and 850 Mev
M. Hirata, N. Katagiri, K. Ochi +1
We construct the formula for the photonuclear total absorption cross section using the projection method and the unitarity relation. Our treatment is very effective when interferen…
Effect of channel in the reactions
M. Hirata, K. Ochi, T. Takaki
A model for the two-pion photoproduction on the nucleon proposedearlier is modified to simultaneously explain the total cross sections and the invariant mass spectra. Using this mo…
Cooperative damping mechanism of the resonance in the nuclear photoabsorption
M. Hirata, K. Ochi, T. Takaki
We propose a resonance damping mechanism to explain the disappearance of the peaks around the position of the resonances higher than the resonance in the nuclear photoabsorptio…
Photoabsorption on a Nucleon in the D_{13} Resonance Energy Region
Kazuyuki Ochi, Michihiro Hirata, Takashi Takaki
We present a simple model for the reaction which reproduces the cross sections of the and channels over the range of the…
Phenomenological interaction between current quarks
Michihiro Hirata, Naoto Tsutsui
We construct a phenomenological model which describes the dynamical chiral symmetry breaking (DCSB) of QCD vacuum and reproduces meson spectra. Quark condensates, the pion decay co…