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Journal of the Korean Physical Society

, Volume 62, Issue 12, pp 1778–1781 | Cite as

Synchrotron X-ray spectroscopy study on the valence state in α- and β-YbAlB4 at low temperatures and high magnetic fields

  • Y. H. MatsudaEmail author
  • T. Nakamura
  • K. Kuga
  • S. Nakatsuji
  • S. Michimura
  • T. Inami
  • N. Kawamura
  • M. Mizumaki
Article

Abstract

The valence state of Yb ions in β-YbAlB4 and its polymorph α-YbAlB4 has been investigated by using X-ray absorption and emission spectroscopy in SPring-8 at temperatures from 2 to 280 K. The observed Yb valence is 2.78 ± 0.01 in β-YbAlB4 at 2 K by using the X-ray emission spectroscopy. The valence is found to gradually increase with increasing temperature toward the trivalent state, and the characteristic temperature of the valence fluctuation is expected to be about 290 K. We also found a small increase in the Yb valence (∼ 0.002) by applying a magnetic field of 32 T at 40 K to β-YbAlB4.

Keywords

Valence fluctuation Heavy fermion High magnetic fields 

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Copyright information

© The Korean Physical Society 2013

Authors and Affiliations

  • Y. H. Matsuda
    • 1
    Email author
  • T. Nakamura
    • 1
  • K. Kuga
    • 1
  • S. Nakatsuji
    • 1
  • S. Michimura
    • 2
  • T. Inami
    • 2
  • N. Kawamura
    • 3
  • M. Mizumaki
    • 3
  1. 1.Institute for Solid State PhysicsUniversity of TokyoChibaJapan
  2. 2.Japan Atomic Energy AgencySayo, HyogoJapan
  3. 3.SPring-8/Japan Synchrotron Radiation Research InstituteSayo, HyogoJapan

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