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Dive into the research topics where Akira Chikamatsu is active.

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Featured researches published by Akira Chikamatsu.


Applied Physics Express | 2008

Electronic Band Structure of Transparent Conductor: Nb-Doped Anatase TiO2

Taro Hitosugi; Hideyuki Kamisaka; Koichi Yamashita; Hiroyuki Nogawa; Yutaka Furubayashi; Shoichiro Nakao; Naoomi Yamada; Akira Chikamatsu; H. Kumigashira; Masaharu Oshima; Yasushi Hirose; Toshihiro Shimada; Tetsuya Hasegawa

We have investigated electronic band structure of a transparent conducting oxide, Nb-doped anatase TiO2 (TNO), by means of first-principles band calculations and photoemission measurements. The band calculations revealed that Nb 4d orbitals are strongly hybridized with Ti 3d ones to form a d-nature conduction band, without impurity states in the in-gap region, resulting in high carrier density exceeding 1021 cm-3 and excellent optical transparency in the visible region. Furthermore, we confirmed that the results of valence band and core-level photoemission measurements are consistent with prediction by the present band calculations.


Physical Review B | 2005

In vacuo photoemission study of atomically controlled La 1 − x Sr x Mn O 3 thin films: Composition dependence of the electronic structure

K. Horiba; Akira Chikamatsu; Hiroshi Kumigashira; M. Oshima; N. Nakagawa; Mikk Lippmaa; Kanta Ono; M. Kawasaki; Hideomi Koinuma

We have investigated change in the electronic structures of atomically controlled


Applied Physics Letters | 2004

Inherent charge transfer layer formation at La0.6Sr0.4FeO3∕La0.6Sr0.4MnO3 heterointerface

Hiroshi Kumigashira; Dai Kobayashi; R. Hashimoto; Akira Chikamatsu; M. Oshima; N. Nakagawa; Tsuyoshi Ohnishi; Mikk Lippmaa; H. Wadati; A. Fujimori; Kanta Ono; M. Kawasaki; Hideomi Koinuma

{\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}\mathrm{Mn}{\mathrm{O}}_{3}


Physical Review B | 2006

Chemical potential shift and spectral-weight transfer in Pr1- xCaxMnO3 revealed by photoemission spectroscopy

K. Ebata; H. Wadati; M. Takizawa; A. Fujimori; Akira Chikamatsu; Hiroshi Kumigashira; M. Oshima; Y. Tomioka; Y. Tokura

(LSMO) thin films as a function of hole-doping levels


Applied Physics Letters | 2006

Robust Ti4+ states in SrTiO3 layers of La0.6Sr0.4MnO3∕SrTiO3∕La0.6Sr0.4MnO3 junctions

Hiroshi Kumigashira; Akira Chikamatsu; R. Hashimoto; M. Oshima; Tsuyoshi Ohnishi; Mikk Lippmaa; H. Wadati; A. Fujimori; Kanta Ono; M. Kawasaki; Hideomi Koinuma

(x)


Journal of Applied Physics | 2010

Transport properties and electronic states of anatase Ti1−xWxO2 epitaxial thin films

Utahito Takeuchi; Akira Chikamatsu; Taro Hitosugi; Hiroshi Kumigashira; Masaharu Oshima; Yasushi Hirose; Toshihiro Shimada; Tetsuya Hasegawa

in terms of in vacuo photoemission spectroscopy (PES) and x-ray absorption spectroscopy (XAS) measurements. The in vacuo PES measurements on a well-ordered surface of high-quality epitaxial LSMO thin films enable us to reveal their intrinsic electronic structures, especially the structure near the Fermi level


Physical Review B | 2005

Manifestation of correlation effects in the photoemission spectra of Ca1-xSrxRuO3

M. Takizawa; D. Toyota; H. Wadati; Akira Chikamatsu; Hiroshi Kumigashira; A. Fujimori; M. Oshima; Zhong Fang; Mikk Lippmaa; M. Kawasaki; Hideomi Koinuma

({E}_{F})


Applied Physics Letters | 2014

Metallic transport and large anomalous Hall effect at room temperature in ferrimagnetic Mn4N epitaxial thin film

Xi Shen; Akira Chikamatsu; Kei Shigematsu; Yasushi Hirose; Tomoteru Fukumura; Tetsuya Hasegawa

. We found that overall the features of the valence band as well as the core levels monotonically shifted toward lower binding energy as


Physical Review B | 2006

Band structure and Fermi surface of La 0.6 Sr 0.4 MnO 3 thin films studied by in situ angle-resolved photoemission spectroscopy

Akira Chikamatsu; H. Wadati; Hiroshi Kumigashira; M. Oshima; A. Fujimori; Noriaki Hamada; Tsuyoshi Ohnishi; Mikk Lippmaa; K. Ono; M. Kawasaki; Hideomi Koinuma

x


Physical Review B | 2005

Valence changes associated with the metal-insulator transition in Bi1-xLaxNiO3

H. Wadati; M. Takizawa; T. T. Tran; K. Tanaka; T. Mizokawa; A. Fujimori; Akira Chikamatsu; Hiroshi Kumigashira; Masaharu Oshima; Shintaro Ishiwata; Masaki Azuma; M. Takano

was increased, indicating the systematic chemical-potential shift of LSMO thin films with hole doping. The peak nearest to

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Tetsuya Hasegawa

National Institute for Materials Science

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