Valence Fluctuations in Yb(Al,Fe)B₄ Studied by Nanosecond-time-resolved Photoemission Spectroscopy Using Synchrotron Radiation

• Okawa M.

  Department of Applied Physics, Tokyo University of Science

• Akikubo K.

  The Institute for Solid State Physics, The University of Tokyo

• Yamamoto S.

  The Institute for Solid State Physics, The University of Tokyo

• Matsuda I.

  The Institute for Solid State Physics, The University of Tokyo

• Saitoh T.

  Department of Applied Physics, Tokyo University of Science

抄録

Temporal variations of valence states of the α-YbAl_1−xFe_xB₄ crystals (x = 0, 0.013, and 0.098) are experimentally examined in a nanosecond time-scale by time-resolved photoemission experiments using synchrotron radiation. The Yb 4f spectral features show no apparent change with time during relaxations after the optical pumping. The present experimental result indicates that dynamics of valence fluctuations in the material are likely dominated by a picosecond or much faster time-scale. The time-resolved measurement at the time-resolution limit at synchrotron radiation captured the trace of valence fluctuations.

収録刊行物

• e-Journal of Surface Science and Nanotechnology

  e-Journal of Surface Science and Nanotechnology 19 (0), 20-23, 2021-03-18

  公益社団法人 日本表面真空学会

キーワード

• <i>Time-resolved photoemission spectroscopy</i>
• <i>Heavy-fermion</i>
• <i>Boride</i>
• <i>YbAlB₄</i>

詳細情報

• CRID: 1390287385364121216
• NII論文ID: 130008000133
• DOI: 10.1380/ejssnt.2021.20
• ISSN: 13480391
• Web Site: https://www.jstage.jst.go.jp/article/ejssnt/19/0/19_20/_pdf
• 本文言語コード: en
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• 抄録ライセンスフラグ: 使用可