Photoemission Evidence for Valence Fluctuations and Kondo Resonance in YbAl2

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概要

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• We use hard x-ray photoemission spectroscopy (HAXPES) to investigate the electronic structure of YbAl2, for which the Yb valence has not been consistently reported to date. The bulk sensitivity and the analytical simplicity provided by the Yb 3d core-level HAXPES allow a reliable determination of the mean valence of Yb ions. For YbAl2, it is evaluated to be +2.20, which remains nearly unchanged below 300 K. The Kondo resonance peak with an extremely high Kondo temperature (above 2000 K) is clearly identified in the valence-band spectra. The results indicate that a coherent Kondo state can be robust even in a nearly divalent system.

• 2012-07-15

著者

• CHAINANI Ashish

  RIKEN/SPring-8

• Kosaka Masashi

  Graduate School Of Science And Engineering Saitama University

• YABASHI Makina

  RIKEN

• Taguchi Munetaka

  Riken

• EGUCHI Ritsuko

  RIKEN SPring-8 Center

• TAMASAKU Kenji

  RIKEN/Spring-8

• Takata Yasutaka

  Riken Spring-8 Center

• Ishikawa Tetsuya

  Riken Harima Institute

• Shin Shik

  Institute For Solid State Physics (issp) University Of Tokyo

• Oura Masaki

  Riken

• Nishino Yoshinori

  Riken Harima Institute

• Shin Shik

  Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan

• MATSUNAMI Masaharu

  Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan

• Tamasaku Kenji

  RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan

• Yabashi Makina

  RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan

• Eguchi Ritsuko

  RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan

• Chainani Ashish

  RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan

• Oura Masaki

  RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan

• Kosaka Masashi

  Graduate School of Science and Engineering, Saitama University, Saitama 338-8570, Japan

• Nishino Yoshinori

  RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan

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