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ID 19350
本文ファイル
著者
Arita, Masashi
Hiraoka, Koichi
Kojima, Kenichi
Takeda, Yukiharu
Yoshikawa, Kunta
Takata, Yasutaka
Ikenaga, Eiji
Shin, Shik
Kobayashi, Keisuke
Tamasaku, Kenji
Nishino, Yoshinori
Miwa, Daigo
Yabashi, Makina
Ishikawa, Tetsuya
キーワード
ytterbium alloys
indium alloys
copper alloys
X-ray photoelectron spectra
mixed valence compounds
valence bands
抄録(英)
Yb 3d and valence-band photoemission spectra of the first-order valence-transition compound YbInCu4 have been measured with hard x ray at an excitation energy of 5.95 keV. Abrupt changes are clearly observed in both spectra around the transition temperature TV = 42 K, in comparison with ultraviolet and soft x-ray photoemission (VUV-PES and SX-PES) spectra. From the Yb 3d spectra, the Yb valence has been estimated to be ~2.90 from 220 down to 50 K and ~2.74 at 30–10 K. We propose that Yb 3d hard x-ray photoemission spectroscopy is a very powerful method to estimate the valence of Yb with high accuracy. On the other hand, the Yb2+ 4f-derived peaks in the valence-band spectra exhibit a remarkable enhancement below TV. The shape of the valence-band spectra is different from those of the VUV-PES and SX-PES spectra above TV, reflecting the In 5s and 5p contributions.
掲載誌名
Physical Review Letters
93巻
24号
開始ページ
246404-1
終了ページ
246404-4
出版年月日
2004-12-10
出版者
American Physical Society
ISSN
0031-9007
NCID
出版者DOI
言語
英語
NII資源タイプ
学術雑誌論文
広大資料タイプ
学術雑誌論文
DCMIタイプ
text
フォーマット
application/pdf
著者版フラグ
publisher
権利情報
Copyright (c) 2004 The American Physical Society.
関連情報URL
部局名
総合科学研究科
理学研究科
放射光科学研究センター