222 citations · 818 across the 29 of their papers we have counts for
16 papers · 1 filter
Photo-induced Antiferromagnetic-ferromagnetic Transition and Electronic Structure Modulation in GdBaCoO Thin Film
Yujun Zhang, Tsukasa Katayama, Akira Chikamatsu +9
We investigate both the ferromagnetic (FM) and antiferromagnetic (AFM) ultrafast dynamics of a strongly correlated oxide system, GdBaCoO thin film, by time-resolved x-r…
A pseudospinon continuum in CaIrO
Matteo Rossi, Pietro Marabotti, Yasuyuki Hirata +6
In so-called systems, including some iridates and ruthenates, the coherent superposition of orbitals in the ground state gives rise to hoppin…
Spin-orbital liquid in BaCuSbO stabilized by oxygen holes
Kou Takubo, Takashi Mizokawa, Huiyuan Man +7
Both the Jahn-Teller distortion of CuO octahedra and magnetic ordering are absent in hexagonal BaCuSbO suggesting a Cu 3 spin-orbital liquid state. Here,…
Interfacial-hybridization-modified Ir Ferromagnetism and Electronic Structure in LaMnO/SrIrO Superlattices
Yujun Zhang, Yong Zheng Luo, Liang Wu +19
Artificially fabricated 3/5 superlattices (SLs) involve both strong electron correlation and spin-orbit coupling in one material by means of interfacial 3-5 coupling, w…
Localized character of charge excitations for LaSrNiO revealed by oxygen -edge resonant inelastic X-ray scattering
Kohei Yamagami, Kenji Ishii, Yasuyuki Hirata +7
We performed a resonant inelastic X-ray scattering (RIXS) study of LaSrNiO (LSNO) at the oxygen edge to investigate the nature of the doped holes with reg…
Polar State induced by Block-type Lattice Distortions in BaFe2Se3 with Quasi-One-Dimensional Ladder Structure
Takuya Aoyama, Satoshi Imaizumi, Takuya Togashi +6
Temperature dependent crystal structures of the quasi-one-dimensional ladder material BaFe2Se3 are examined. Combining the optical second harmonic generation (SHG) experiments and…
Commensurate vs incommensurate charge ordering near the superconducting dome in IrPtTe revealed by resonant x-ray scattering
K. Takubo, K. Yamamoto, Y. Hirata +13
The electronic-structural modulations of IrPtTe (0 0.12) have been examined by resonant elastic x-ray scattering (REXS) and resonant inelastic x-ray…
Tensile-Strain Dependent Spin States in Epitaxial LaCoO Thin Films
Y. Yokoyama, Y. Yamasaki, M. Taguchi +11
The spin states of Co ions in perovskite-type LaCoO, governed by complex interplay between the electron-lattice interactions and the strong electron correlations, still…
Thickness dependence and dimensionality effects of charge and magnetic orderings in La1/3Sr2/3FeO3 thin films
Kohei Yamamoto, Yasuyuki Hirata, Masafumi Horio +9
We investigate the thickness effects on charge and magnetic orderings in Fe perovskite oxide La1/3Sr2/3FeO3/SrTiO3 thin films by hard x-ray and resonant soft x-ray scattering (RSXS…
The Effects of Stoichiometry and Substitution in quasi-one-dimensional iron-chalcogenide BaFeS
Yasuyuki Hirata, Sachiko Maki, Jun-ichi Yamaura +2
The effects of off-stoichiometry and elemental substitution on electronic properties of iron-based ladder compound BaFeS are investigated. Resistivity and magnetization…
Temperature and composition phase diagram in the iron-based ladder compounds Ba1-xCsxFe2Se3
Takafumi Hawai, Yusuke Nambu, Kenya Ohgushi +11
We investigated the iron-based ladder compounds (Ba,Cs)FeSe. Their parent compounds, BaFeSe and CsFeSe, have different space groups, formal valences of Fe a…
Coexistence of localized and itinerant electrons in BaFe2X3 (X = S and Se) revealed by photoemission spectroscopy
D. Ootsuki, N. L. Saini, F. Du +4
We report a photoemission study at room temperature on BaFe2X3 (X = S and Se) and CsFe2Se3 in which two-leg ladders are formed by the Fe sites. The Fe 2p core-level peaks of BaFe2X…
CaIrO3: a Spin-Orbit Mott Insulator Beyond the jeff = 1/2 Ground State
M. Moretti Sala, K. Ohgushi, A. Al-Zein +3
In CaIrO3 electronic correlation, spin-orbit coupling, and tetragonal crystal field splitting are predicted to be of comparable strength. However, the nature of its ground state is…
Complex Orbital State Stabilized by Strong Spin-Orbit Coupling in a Metallic Iridium Oxide IrO
Yasuyuki Hirata, Kenya Ohgushi, Jun-ichi Yamaura +4
Resonant x-ray diffraction experiments were performed for the metallic iridium oxide IrO. We observed anisotropic tensor of susceptibility (ATS) scattering, the spectrum of w…
Observation of Phonon-Assisted Magnon Absorption in Spin-Orbit Coupling Induced Mott Insulator SrIrO
Yasuyuki Hirata, Hiroyuki Tajima, Kenya Ohgushi
The infrared transmission measurement was performed for a two-dimensional spin-orbit coupling induced Mott insulator SrIrO with a layered-perovskite structure. A phonon…
Mechanism of enhanced optical second-harmonic generation in the conducting pyrochlore-type PbIrO oxide compound
Yasuyuki Hirata, Makoto Nakajima, Yusuke Nomura +8
The structural, electronic, and optical properties of pyrochlore-type PbIrOO', which is a metal without spatial inversion symmetry at room temperature, w…