314 citations · 1.6k across the 42 of their papers we have counts for
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Anomalously large spin-dependent electron correlation in nearly half-metallic ferromagnet CoS
Hirokazu Fujiwara, Kensei Terashima, Junya Otsuki +19
The spin-dependent band structure of CoS which is a candidate for a half-metallic ferromagnet was investigated by both spin- and angle-resolved photoemission spectroscopy and t…
Magnetic-field-induced insulator-metal transition in W-doped VO2 at 500 T
Yasuhiro H. Matsuda, Daisuke Nakamura, Akihiko Ikeda +3
Metal-insulator (MI) transitions in correlated electron systems have long been a central and controversial issue in material science. Vanadium dioxide (VO2) exhibits a first-order…
Origins of thermal spin depolarization in half-metallic ferromagnet CrO
H. Fujiwara, K. Terashima, M. Sunagawa +15
Using high-resolution spin-resolved photoemission spectroscopy, we observed a thermal spin depolarization to which all spin-polarized electrons contribute. Furthermore we observed…
Determination of the local structure of SrMIrO (M = K, La) as a function of doping and temperature
K. Terashima, E. Paris, E. Salas-Colera +11
The local structure of correlated spin-orbit insulator SrMIrO (M = K, La) has been investigated by Ir L-edge extended x-ray absorption fine structure measuremen…
Observation of Intrinsic Half-metallic Behavior of CrO (100) Epitaxial Films by Bulk-sensitive Spin-resolved PES
Hirokazu Fujiwara, Masanori Sunagawa, Kensei Terashima +4
We have investigated the electronic states and spin polarization of half-metallic ferromagnet CrO (100) epitaxial films by bulk-sensitive spin-resolved photoemission spectrosco…
Evolution of remnant Fermi surface state in lightly-doped correlated spin-orbit insulator SrLaIrO
K. Terashima, M. Sunagawa, H. Fujiwara +14
Electronic structure has been studied in lightly electron doped correlated spin-orbit insulator SrIrO by angle-resolved photoelectron spectroscopy. We have observed coexist…
Electronic Structures of CeM2Al10 (M = Fe, Ru, and Os) Studied by Soft X-ray Resonant and High-Resolution Photoemission Spectroscopies
Toshihiko Ishiga, Takanori Wakita, Rikiya Yoshida +12
We have performed a photoemission spectroscopy (PES) study of CeM2Al10 (M = Fe, Ru, and Os) to directly observe the electronic structure involved in the unusual magnetic ordering.…
Spinodal Decomposition in the TiO2-VO2 System
Zenji Hiroi, Hiroaki Hayamizu, Toru Yoshida +4
Spinodal decomposition is a ubiquitous phenomenon leading to phase separation from a uniform solution. We show that a spinodal decomposition occurs in a unique combination of two r…
Precise Control of Band Filling in NaxCoO2
Daisuke Yoshizumi, Yuji Muraoka, Yoshihiko Okamoto +5
Electronic properties of the sodium cobaltate NaxCoO2 are systematically studied through a precise control of band filling. Resistivity, magnetic susceptibility and specific heat m…
Anomalous magnetic phase in an undistorted pyrochlore oxide Cd2Os2O7 induced by geometrical frustration
A. Koda, R. Kadono, K. Ohishi +5
We report on the muon spin rotation/relaxation study of a pyrochlore oxide, Cd2Os2O7, which exhibits a metal-insulator (MI) transition at T_{MI}~225 K without structural phase tran…
Photoemission study of TiO2/VO2 interfaces
K. Maekawa, M. Takizawa, H. Wadati +7
We have measured photoemission spectra of two kinds of TiO-capped VO thin films, namely, that with rutile-type TiO (r-TiO/VO) and that with amorphous TiO (a…
Photoemission evidence for a Mott-Hubbard metal-insulator transition in VO
R. Eguchi, M. Taguchi, M. Matsunami +15
The temperature () dependent metal-insulator transition (MIT) in VO is investigated using bulk sensitive hard x-ray ( 8 keV) valence band, core level, and V 2 re…
Spin-1/2 Triangular Lattice with Orbital Degeneracy in a Metallic Oxide Ag2NiO2
H. Yoshida, Y. Muraoka, T. Soergel +2
A novel metallic and magnetic transition metal oxide Ag2NiO2 is studied by means of resistivity, magnetic susceptibility, specific heat and X-ray diffraction. The crystal structure…
Photocarrier Injection and Current-Voltage Characteristics of a La0.8Sr0.2MnO3/SrTiO3:Nb Heterojunction at Low Temperature
Takaki Muramatsu, Yuji Muraoka, Zenji Hiroi
An epitaxial heterojunction made of a p-type perovskite manganite La0.8Sr0.2MnO3 film and an n-type strontium titanate SrTiO3:Nb substrate has been fabricated by the pulsed laser d…
Photocarrier injection and the I-V characteristics of La0.8Sr0.2MnO3/SrTiO3:Nb heterojunctions
Takaki Muramatsu, Yuji Muraoka, Zenji Hiroi
Oxide heterojunctions made of p-type L0.8Sr0.2MnO3 (LSMO) and niobium-doped n-type SrTiO3 (STO:Nb) have been fabricated by the pulsed laser deposition (PLD) technique and are chara…
Photoemission study of the metal-insulator transition in VO_2/TiO_2(001) : Evidence for strong electron-electron and electron-phonon interaction
K. Okazaki, H. Wadati, A. Fujimori +3
We have made a detailed temperature-dependent photoemission study of VO_2/TiO_2(001) thin films, which show a metal-insulator transition at \sim 300 K. Clean surfaces were obtained…
Photocarrier Injection to Transition Metal Oxides
Y. Muraoka, Z. Hiroi
This paper has been withdrawn by the author(s), due a crucial error in the data.
The second phase transition in the pyrochlore oxide Cd2Re2O7
Zenji Hiroi, Jun-Ichi Yamaura, Yuji Muraoka +1
Evidence for another phase transition at 120 K in the metallic pyrochlore oxide Cd2Re2O7, following the structural transition at 200 K and followed by the superconducting transitio…