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Title: Epitaxial growth and electronic structure of oxyhydride SrVO{sub 2}H thin films

Abstract

Oxyhydride SrVO{sub 2}H epitaxial thin films were fabricated on SrTiO{sub 3} substrates via topotactic hydridation of oxide SrVO{sub 3} films using CaH{sub 2}. Structural and composition analyses suggested that the SrVO{sub 2}H film possessed one-dimensionally ordered V-H{sup −}-V bonds along the out-of-plane direction. The synthesis temperature could be lowered by reducing the film thickness, and the SrVO{sub 2}H film was reversible to SrVO{sub 3} by oxidation through annealing in air. Photoemission and X-ray absorption spectroscopy measurements revealed the V{sup 3+} valence state in the SrVO{sub 2}H film, indicating that the hydrogen existed as hydride. Furthermore, the electronic density of states was highly suppressed at the Fermi energy, consistent with the prediction that tetragonal distortion induces metal to insulation transition.

Authors:
; ; ;  [1];  [2]; ;  [3];  [4];  [1];  [5]
  1. Department of Chemistry, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033 (Japan)
  2. Kanagawa Academy of Science and Technology, Kawasaki, Kanagawa 213-0012 (Japan)
  3. Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801 (Japan)
  4. Japan Synchrotron Radiation Research Institute (JASRI)/SPring-8, Mikazuki-cho, Hyogo 679-5198 (Japan)
  5. (Japan)
Publication Date:
OSTI Identifier:
22598887
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 120; Journal Issue: 8; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION; ABSORPTION SPECTROSCOPY; AIR; ANNEALING; CALCIUM HYDRIDES; DENSITY OF STATES; ELECTRONIC STRUCTURE; EPITAXY; HYDROGEN; ONE-DIMENSIONAL CALCULATIONS; OXIDES; PHOTOEMISSION; STRONTIUM TITANATES; SUBSTRATES; THICKNESS; THIN FILMS; VANADIUM IONS; X-RAY SPECTROSCOPY

Citation Formats

Katayama, Tsukasa, Chikamatsu, Akira, E-mail: chikamatsu@chem.s.u-tokyo.ac.jp, Yamada, Keisuke, Onozuka, Tomoya, Shigematsu, Kei, Minohara, Makoto, Kumigashira, Hiroshi, Ikenaga, Eiji, Hasegawa, Tetsuya, and Kanagawa Academy of Science and Technology, Kawasaki, Kanagawa 213-0012. Epitaxial growth and electronic structure of oxyhydride SrVO{sub 2}H thin films. United States: N. p., 2016. Web. doi:10.1063/1.4961446.
Katayama, Tsukasa, Chikamatsu, Akira, E-mail: chikamatsu@chem.s.u-tokyo.ac.jp, Yamada, Keisuke, Onozuka, Tomoya, Shigematsu, Kei, Minohara, Makoto, Kumigashira, Hiroshi, Ikenaga, Eiji, Hasegawa, Tetsuya, & Kanagawa Academy of Science and Technology, Kawasaki, Kanagawa 213-0012. Epitaxial growth and electronic structure of oxyhydride SrVO{sub 2}H thin films. United States. doi:10.1063/1.4961446.
Katayama, Tsukasa, Chikamatsu, Akira, E-mail: chikamatsu@chem.s.u-tokyo.ac.jp, Yamada, Keisuke, Onozuka, Tomoya, Shigematsu, Kei, Minohara, Makoto, Kumigashira, Hiroshi, Ikenaga, Eiji, Hasegawa, Tetsuya, and Kanagawa Academy of Science and Technology, Kawasaki, Kanagawa 213-0012. Sun . "Epitaxial growth and electronic structure of oxyhydride SrVO{sub 2}H thin films". United States. doi:10.1063/1.4961446.
@article{osti_22598887,
title = {Epitaxial growth and electronic structure of oxyhydride SrVO{sub 2}H thin films},
author = {Katayama, Tsukasa and Chikamatsu, Akira, E-mail: chikamatsu@chem.s.u-tokyo.ac.jp and Yamada, Keisuke and Onozuka, Tomoya and Shigematsu, Kei and Minohara, Makoto and Kumigashira, Hiroshi and Ikenaga, Eiji and Hasegawa, Tetsuya and Kanagawa Academy of Science and Technology, Kawasaki, Kanagawa 213-0012},
abstractNote = {Oxyhydride SrVO{sub 2}H epitaxial thin films were fabricated on SrTiO{sub 3} substrates via topotactic hydridation of oxide SrVO{sub 3} films using CaH{sub 2}. Structural and composition analyses suggested that the SrVO{sub 2}H film possessed one-dimensionally ordered V-H{sup −}-V bonds along the out-of-plane direction. The synthesis temperature could be lowered by reducing the film thickness, and the SrVO{sub 2}H film was reversible to SrVO{sub 3} by oxidation through annealing in air. Photoemission and X-ray absorption spectroscopy measurements revealed the V{sup 3+} valence state in the SrVO{sub 2}H film, indicating that the hydrogen existed as hydride. Furthermore, the electronic density of states was highly suppressed at the Fermi energy, consistent with the prediction that tetragonal distortion induces metal to insulation transition.},
doi = {10.1063/1.4961446},
journal = {Journal of Applied Physics},
number = 8,
volume = 120,
place = {United States},
year = {Sun Aug 28 00:00:00 EDT 2016},
month = {Sun Aug 28 00:00:00 EDT 2016}
}