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Electronic Structures of Heavily Boron-doped Superconducting Diamond Films

Published online by Cambridge University Press:  01 February 2011

Takayoshi Yokoya
Affiliation:
yokoya@cc.okayama-u.ac.jp, Okayama University, The Graduate School of Natural Science and Technology,, 3-1-1,Tsushima-naka, Okayama, 700-8530, Japan, +81-86-251-7897, +81-86-251-7903
Hiroyuki Okazaki
Affiliation:
yuzan@cc.okayama-u.ac.jp, Okayama University, The Graduate School of Natural Science and Technology, 3-1-1,Tsushima-naka, Okayama, 700-8530, Japan
Tetsuya Nakamura
Affiliation:
naka@spring8.or.jp, Japan Synchrotron Radiation Research Institute(JASRI)/Spring-8, 1-1-1 Kouto, Sayo, 679-5198, Japan
Tomohiro Matsushita
Affiliation:
matushita@spring8.or.jp, Japan Synchrotron Radiation Research Institute(JASRI)/Spring-8, 1-1-1 Kouto, Sayo, 679-5198, Japan
Takayuki Muro
Affiliation:
muro@spring8.or.jp, Japan Synchrotron Radiation Research Institute(JASRI)/Spring-8, 1-1-1 Kouto, Sayo, 679-5198, Japan
Eiji Ikenaga
Affiliation:
ikenaga@spring8.or.jp, Japan Synchrotron Radiation Research Institute(JASRI)/Spring-8, 1-1-1 Kouto, Sayo, 679-5198, Japan
Masaaki Kobata
Affiliation:
mkobata@spring8.or.jp, Japan Synchrotron Radiation Research Institute(JASRI)/Spring-8, 1-1-1 Kouto, Sayo, 679-5198, Japan
Keisuke Kobayashi
Affiliation:
koba_kei@spring8.or.jp, Japan Synchrotron Radiation Research Institute(JASRI)/Spring-8, 1-1-1 Kouto, Sayo, 679-5198, Japan
Akihisa Takeuchi
Affiliation:
takeuchi@spring8.or.jp, Japan Synchrotron Radiation Research Institute(JASRI)/Spring-8, 1-1-1 Kouto, Sayo, 679-5198, Japan
Akihiro Awaji
Affiliation:
awaji@spring8.or.jp, Japan Synchrotron Radiation Research Institute(JASRI)/Spring-8, 1-1-1 Kouto, Sayo, 679-5198, Japan
Yoshihiko Takano
Affiliation:
TAKANO.Yoshihiko@nims.go.jp, National Institute for Material Science, 1-2-1 Sengen, Tsukuba, 305-0047, Japan
Masanori Nagao
Affiliation:
NAGAO.Masanori@nims.go.jp, National Institute for Material Science, 1-2-1 Sengen, Tsukuba, 305-0047, Japan
Tomohiro Takenouchi
Affiliation:
chidai@moegi.waseda.ac.jp, Waseda Univeristy, School of Science and Engineering, 3-4-1 Okubo, Shinjuku, 169-8555, Japan
Hiroshi Kawarada
Affiliation:
kawarada@waseda.jp, Waseda Univeristy, School of Science and Engineering, 3-4-1 Okubo, Shinjuku, 169-8555, Japan
Tamio Oguchi
Affiliation:
Oguchi@hiroshima-u.ac.jp, Hiroshima University, Department of Quantum Matter, Graduate School of Advanced Sciences of Matter (ADSM), 1-3-1 Kagamiyama, Higashi-Hiroshima, 739-8530, Japan
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Abstract

Recent photoemission studies on heavily boron-doped superconducting diamond films, reporting the electronic structure evolution as a function of boron concentrations, are reviewed. From soft X-ray angle-resolved photoemission spectroscopy, which directly measures electronic band dispersions, depopulation of electrons (or formation of hole pockets) at the top of the valence band were clearly observed. This indicates that the holes at the top of the valence bands are responsible for the metallic properties and hence superconductivity at lower temperatures. Hard X-ray photoemission spectroscopy observed shift of the main C 1s core level and intensity evolution of a lower binding energy additional structure, suggesting chemical potential shift, carrier doping efficiency by boron doping, and possibility of boron-related cluster formations.

Type
Research Article
Copyright
Copyright © Materials Research Society 2007

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