222 citations · 818 across the 29 of their papers we have counts for
29 papers
Photocarrier Transport of Ferroelectric Photovoltaic Thin Films Detected by the Magnetic Dynamics of Adjacent Ferromagnetic Layers
Yujun Zhang, Ji Ma, Keisuke Ikeda +7
We have observed photocarrier transport behaviors in BiFeO/LaSrMnO~(BFO/LSMO) heterostructures by using time-resolved synchrotron x-ray magnetic circular dichro…
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…
Polarization-Resolved Extreme Ultraviolet Second Harmonic Generation from LiNbO
Can B. Uzundal, Sasawat Jamnuch, Emma Berger +17
Second harmonic generation (SHG) spectroscopy ubiquitously enables the investigation of surface chemistry, interfacial chemistry as well as symmetry properties in solids. Polarizat…
A novel measurement approach for near-edge x-ray absorption fine structure: continuous 2 angular rotation of linear polarization
Yoshiki Kudo, Yasuyuki Hirata, Masafumi Horio +2
A new technical method is developed for soft x-ray spectroscopy of near-edge x-ray absorption fine structure (NEXAFS). The measurement is performed with continuously rotating linea…
Direct observation of symmetry-breaking in a 'ferroelectric' polar metal
Emma Berger, Sasawat Jamnuch, Can Uzundal +17
Ferroelectric materials contain a switchable spontaneous polarization that persists even in the absence of an external electric field. The coexistence of ferroelectricity and metal…
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…
Intrinsic 2D Ferromagnetism in V5Se8 Epitaxial Thin Films
Masaki Nakano, Yue Wang, Satoshi Yoshida +11
The discoveries of intrinsic ferromagnetism in atomically-thin van der Waals crystals have opened up a new research field enabling fundamental studies on magnetism at two-dimension…
Element-selective tracking ultrafast demagnetization process in Co/Pt multilayer thin films by the resonant magneto-optical Kerr effect
Kohei Yamamoto, Souliman El Moussaoui, Yasuyuki Hirata +8
We examined the photo-induced dynamics of ferromagnetic Co/Pt thin films demonstrating perpendicular magnetic anisotropy with element specificity using resonant polar magneto-optic…
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…
Nature of carrier doping in T'-La1.8-xEu0.2SrxCuO4 studied by X-Ray Photoemission and Absorption Spectroscopy
Chun Lin, Masafumi Horio, Takayuki Kawamata +15
Recently, hole-doped superconducting cuprates with the T'-structure La1.8-xEu0.2SrxCuO4 (LESCO) have attracted a lot of attention. We have performed x-ray photoemission and absorpt…
Study of photoinduced valence dynamics in EuNi(SiGe) through time-resolved X-ray absorption spectroscopy
Y. Yokoyama, K. Kawakami, Y. Hirata +10
The photoinduced valence dynamics of EuNi(SiGe) are investigated using time-resolved X-ray absorption spectroscopy for Eu -edge. Through the pump-pro…
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…
Ultrafast demagnetization of Pt magnetic moment in L1-FePt probed by hard x-ray free electron laser
Kohei Yamamoto, Yuya Kubota, Motohiro Suzuki +15
We demonstrate ultrafast magnetization dynamics in a 5d transition metal using circularly-polarized x-ray free electron laser in the hard x-ray region. A decay time of light-induce…
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…
Electronic Structure of Ce-Doped and -Undoped NdCuO Superconducting Thin Films Studied by Hard X-ray Photoemission and Soft X-ray Absorption Spectroscopy
M. Horio, Y. Krockenberger, K. Yamamoto +11
In order to realize superconductivity in cuprates with the T'-type structure, not only chemical substitution (Ce doping) but also post-growth reduction annealing is necessary. In t…
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…
Capturing ultrafast magnetic dynamics by time-resolved soft x-ray magnetic circular dichroism
Kou Takubo, Kohei Yamamoto, Yasuyuki Hirata +9
Experiments of time-resolved x-ray magnetic circular dichroism (Tr-XMCD) and resonant x-ray scattering at a beamline BL07LSU in SPring-8 with a time-resolution of under 50 ps are p…
The magnetic precursor of the pressure-induced superconductivity in Fe-ladder compound
Songxue Chi, Yoshiya Uwatoko, Huibo Cao +4
The pressure effects on the antiferromagentic orders in iron-based ladder compounds CsFeSe and BaFeS have been studied using neutron diffraction. With identical cry…
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…
Pressure-induced Superconductivity in the Iron-based Ladder Material BaFe2S3
Hiroki Takahashi, Akira Sugimoto, Yusuke Nambu +13
All the iron-based superconductors identified to date share a square lattice composed of Fe atoms as a common feature, despite having different crystal structures. In copper-based…
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…