Valence Transition of YbInCu4 Observed in Hard X-Ray Photoemission Spectra

Physical Review Letters 93 巻 24 号 246404-1-246404-4 頁 2004-12-10 発行
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タイトル ( eng )
Valence Transition of YbInCu4 Observed in Hard X-Ray Photoemission Spectra
作成者
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
収録物名
Physical Review Letters
93
24
開始ページ 246404-1
終了ページ 246404-4
抄録
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.
著者キーワード
ytterbium alloys
indium alloys
copper alloys
X-ray photoelectron spectra
mixed valence compounds
valence bands
言語
英語
資源タイプ 学術雑誌論文
出版者
American Physical Society
発行日 2004-12-10
権利情報
Copyright (c) 2004 The American Physical Society.
出版タイプ Version of Record(出版社版。早期公開を含む)
アクセス権 オープンアクセス
収録物識別子
[ISSN] 0031-9007
[DOI] 10.1103/PhysRevLett.93.246404
[NCID] AA00773679
[DOI] http://dx.doi.org/10.1103/PhysRevLett.93.246404