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

Hitoshi Sato, Kenya Shimada, Masashi Arita, Koichi Hiraoka, Kenichi Kojima, Yukiharu Takeda, Kunta Yoshikawa, Masahiro Sawada, Masashi Nakatake, Hirofumi Namatame, Masaki Taniguchi, Yasutaka Takata, Eiji Ikenaga, Shik Shin, Keisuke Kobayashi, Kenji Tamasaku, Yoshinori Nishino, Daigo Miwa, Makina Yabashi, and Tetsuya Ishikawa
Phys. Rev. Lett. 93, 246404 – Published 10 December 2004

Abstract

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=42K, 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.

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  • Received 31 May 2004

DOI:https://doi.org/10.1103/PhysRevLett.93.246404

©2004 American Physical Society

Authors & Affiliations

Hitoshi Sato1,*, Kenya Shimada1, Masashi Arita1, Koichi Hiraoka2, Kenichi Kojima3, Yukiharu Takeda1,†, Kunta Yoshikawa4, Masahiro Sawada1, Masashi Nakatake1, Hirofumi Namatame1, Masaki Taniguchi1,4, Yasutaka Takata5, Eiji Ikenaga6, Shik Shin5,7, Keisuke Kobayashi6, Kenji Tamasaku8, Yoshinori Nishino8, Daigo Miwa8, Makina Yabashi6, and Tetsuya Ishikawa8

  • 1Hiroshima Synchrotron Radiation Center, Hiroshima University, Kagamiyama 2-313, Higashi-Hiroshima 739-8526, Japan
  • 2Faculty of Engineering, Ehime University, Bunkyo-cho 3, Matsuyama 790-8577, Japan
  • 3Faculty of Integrated Arts and Sciences, Hiroshima University, Kagamiyama 1-7-1, Higashi-Hiroshima 739-8521, Japan
  • 4Graduate School of Science, Hiroshima University, Kagamiyama 1-3-1, Higashi-Hiroshima 739-8526, Japan
  • 5Soft X-Ray Spectroscopy Laboratory, RIKEN/SPring-8, Koto 1-1-1, Mikazuki-cho, Sayo-gun, Hyogo 679-5148, Japan
  • 6JASRI/SPring-8, Koto 1-1-1, Mikazuki-cho, Sayo-gun, Hyogo 679-5198, Japan
  • 7Institute for Solid State Physics (ISSP), The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
  • 8Coherent X-Ray Optics Laboratory, RIKEN/SPring-8, Koto 1-1-1, Mikazuki-cho, Sayo-gun, Hyogo 679-5148, Japan

  • *Electronic address: jinjin@hiroshima-u.ac.jp
  • Present address: Synchrotron Radiation Research Center, JAERI/SPring-8, Koto 1-1-1, Mikazuki-cho, Sayo-gun, Hyogo 679-5148, Japan

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Issue

Vol. 93, Iss. 24 — 10 December 2004

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