160 citations · 826 across the 27 of their papers we have counts for
27 papers
Development of magnetism in Fe-doped magnetic semiconductors: Resonant photoemission and x-ray magnetic circular dichroism studies of (Ga,Fe)As
Takahito Takeda, Shoya Sakamoto, Le Duc Anh +8
Fe-doped III-V ferromagnetic semiconductors (FMSs) such as (In,Fe)As, (Ga,Fe)Sb, (In,Fe)Sb, and (Al,Fe)Sb are promising materials for spintronic device applications because of the…
Inter-valence charge transfer and charge transport in the spinel ferrite ferromagnetic semiconductor Ru-doped CoFeO
Masaki Kobayashi, Munetoshi Seki, Masahiro Suzuki +6
Inter-valence charge transfer (IVCT) is electron transfer between two metal sites differing in oxidation states through a bridging ligand: $M^{n+1} + M'^{m} \rightarrow M^{n} +…
Minority-Spin Impurity Band in n-Type (In,Fe)As: A Materials Perspective for Ferromagnetic Semiconductors
Masaki Kobayashi, Le Duc Anh, Jan Minar +9
Fully understanding the properties of n-type ferromagnetic semiconductors (FMSs), complementary to the mainstream p-type ones, is a challenging goal in semiconductor spintronics be…
Alternation of Magnetic Anisotropy Accompanied by Metal-Insulator Transition in Strained Ultrathin Manganite Heterostructures
Masaki Kobayashi, Le Duc Anh, Masahiro Suzuki +6
Fundamental understanding of interfacial magnetic properties in ferromagnetic heterostructures is essential to utilize ferromagnetic materials for spintronic device applications. I…
Evolution of the Fe-3 impurity band state as the origin of high Curie temperature in p-type ferromagnetic semiconductor (Ga,Fe)Sb
Takahito Takeda, Shoya Sakamoto, Kohsei Araki +8
(Ga,Fe)Sb is one of the promising ferromagnetic semiconductors for spintronic device applications because its Curie temperature () is above 300 K when the Fe…
Hard and soft x-ray photoemission spectroscopy study of the new Kondo system SmO thin film
Shoya Sakamoto, Kenichi Kaminaga, Daichi Oka +15
SmO thin film is a new Kondo system showing a resistivity upturn around 10 K and was theoretically proposed to have a topologically nontrivial band structure. We have performed har…
Hybridization between the ligand band and Fe-3 orbitals in the p-type ferromagnetic semiconductor (Ga,Fe)Sb
Takahito Takeda, Masahiro Suzuki, Le Duc Anh +13
(Ga,Fe)Sb is a promising ferromagnetic semiconductor for practical spintronic device applications because its Curie temperature () is above room temperature. However, th…
Relationship between charge redistribution and ferromagnetism at the heterointerface between perovskite oxides LaNiO and LaMnO
Miho Kitamura, Masaki Kobayashi, Enju Sakai +10
To investigate the relationship between the charge redistribution and ferromagnetism at the heterointerface between perovskite transition-metal oxides LaNiO (LNO) and LaMnO…
Magnetization process of the insulating ferromagnetic semiconductor (Al,Fe)Sb
Shoya Sakamoto, Le Duc Anh, Pham Nam Hai +12
We have studied the magnetization process of the new insulating ferromagnetic semiconductor (Al,Fe)Sb by means of x-ray magnetic circular dichroism. For an optimally doped sample w…
Direct Observation of Orbital Hybridisation in a Cuprate Superconductor
Christian E. Matt, D. Sutter, A. M. Cook +23
The minimal ingredients to explain the essential physics of layered copper-oxide (cuprates= materials remains heavily debated. Effective low energy single-band models of the copper…
Emergence of quantum critical behavior in metallic quantum-well states of strongly correlated oxides
Masaki Kobayashi, Kohei Yoshimatsu, Taichi Mitsuhashi +7
Controlling quantum critical phenomena in strongly correlated electron systems, which emerge in the neighborhood of a quantum phase transition, is a major challenge in modern conde…
Alternative interpretation of the recent experimental results of angle-resolved photoemission spectroscopy on GaMnAs [Sci. Rep. 6, 27266 (2016)]
Masaki Kobayashi, Shinobu Ohya, Iriya Muneta +8
Clarification of the position of the Fermi level () is important in understanding the origin of ferromagnetism in the prototypical ferromagnetic semiconductor Ga$_{1-…
Fermi surface and effective masses in photoemission response of the (BaK)FeAs superconductor
Gerald Derondeau, Federico Bisti, Masaki Kobayashi +9
The angle-resolved photoemission spectra of the superconductor (BaK)FeAs have been investigated both experimentally and theoretically. Our results explain the p…
Quasiparticle interference on cubic perovskite oxide surfaces
Yoshinori Okada, Tay-Rong Chang, Guoqing Chang +7
We report the first observation of coherent surface states on cubic perovskite oxide SrVO3(001) thin films through spectroscopic imaging scanning tunneling microscopy. A direct lin…
Surface Kondo Effect and Non-Trivial Metallic State of the Kondo Insulator YbB12
Kenta Hagiwara, Yoshiyuki Ohtsubo, Masaharu Matsunami +13
A synergistic effect between strong electron correlation and spin-orbit interaction (SOI) has been theoretically predicted to result in a new topological state of quantum matter on…
Hubbard band or oxygen vacancy states in the correlated electron metal SrVO?
S. Backes, T. C. Rödel, F. Fortuna +19
We study the effect of oxygen vacancies on the electronic structure of the model strongly correlated metal SrVO. By means of angle-resolved photoemission (ARPES) synchrotron ex…
Fermi Surfaces and - Hybridization in the Diluted Magnetic Semiconductor BaK(ZnMn)As Studied by Soft X-ray Angle Resolved Photoemission Spectroscopy
H. Suzuki, G. Q. Zhao, K. Zhao +14
The electronic structure of the new diluted magnetic semiconductor BaK(ZnMn)As (, ) in single crystal form has been investig…
Magnetization Process of the n-type Ferromagnetic Semiconductor (In,Fe)As:Be Studied by X-ray Magnetic Circular Dichroism
Shoya Sakamoto, Le Duc Anh, Pham Nam Hai +7
In order to investigate the mechanism of ferromagnetic ordering in the new n-type magnetic semiconductor (In,Fe)As co-doped with Be, we have performed X-ray absorption spectroscopy…
Isotropic Kink and Quasiparticle Excitations in the Three-Dimensional Perovskite Manganite LaSrMnO
Koji Horiba, Miho Kitamura, Kohei Yoshimatsu +5
In order to reveal many-body interactions in the three-dimensional (3D) perovskite manganite, we have performed an angle-resolved photoemission spectroscopy (ARPES) on…
Origin of the anomalous mass renormalization in metallic quantum well states of correlated oxide SrVO
Masaki Kobayashi, Kohei Yoshimatsu, Enju Sakai +4
angle-resolved photoemission spectroscopy (ARPES) has been performed on SrVO ultrathin films, which show metallic quantum well (QW) states, to unveil the origin of…
Coexistence of Bloch electrons and glassy electrons in Ca10(Ir4As8)(Fe2_xIrxAs2)5 revealed by angle-resolved photoemission spectroscopy
K. Sawada, D. Ootsuki, K. Kudo +9
Angle-resolved photoemission spectroscopy of Ca10(Ir4As8)(Fe2_xIrxAs2)5 shows that the Fe 3d electrons in the FeAs layer form the hole-like Fermi pocket at the zone center and the…
Doping-dependent band structure of LaAlO/SrTiO interfaces by soft x-ray polarization-controlled resonant angle-resolved photoemission
Claudia Cancellieri, Mathilde L. Reinle-Schmitt, Masaki Kobayashi +7
Polarization-controlled synchrotron radiation was used to map the electronic structure of buried conducting interfaces of LaAlO/SrTiO in a resonant angle-resolved photoemis…
Unveiling the impurity band inducing ferromagnetism in magnetic semiconductor (Ga,Mn)As
Masaki Kobayashi, Iriya Muneta, Yukiharu Takeda +8
(Ga,Mn)As is a paradigm diluted magnetic semiconductor which shows ferromagnetism induced by doped hole carriers. With a few controversial models emerged from numerous experimental…
Digging up bulk band dispersion buried under a passivation layer
Masaki Kobayashi, Iriya Muneta, Thorsten Schmitt +5
Atomically controlled crystal growth of thin films has established foundations of nanotechnology aimed at the development of advanced functional devices. Crystallization under non-…