Synchrotron X-ray Spectroscopy Study on the Valence State in alpha- and beta-YbAlB4 at Low Temperatures and High Magnetic Fields

Y. H. Matsuda; T. Nakamura; K. Kuga; S. Nakatsuji; S. Michimura; T. Inami; N. Kawamura; M. Mizumaki

doi:10.3938/jkps.62.1778

Synchrotron X-ray Spectroscopy Study on the Valence State in alpha- and beta-YbAlB4 at Low Temperatures and High Magnetic Fields

Strongly Correlated Electrons 2013-08-09 v1

Authors: Y. H. Matsuda , T. Nakamura , K. Kuga , S. Nakatsuji , S. Michimura , T. Inami , N. Kawamura , M. Mizumaki

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Abstract

The valence state of Yb ions in beta-YbAlB4 and its polymorph alpha-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 beta-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 beta-YbAlB4.

Keywords

ytterbium aluminoboride valence state x-ray emission spectroscopy valence fluctuation high magnetic field low temperature

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@article{arxiv.1308.1735,
  title  = {Synchrotron X-ray Spectroscopy Study on the Valence State in alpha- and beta-YbAlB4 at Low Temperatures and High Magnetic Fields},
  author = {Y. H. Matsuda and T. Nakamura and K. Kuga and S. Nakatsuji and S. Michimura and T. Inami and N. Kawamura and M. Mizumaki},
  journal= {arXiv preprint arXiv:1308.1735},
  year   = {2013}
}

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proceedings of the ICM 2012 (Busan, Korea)

Synchrotron X-ray Spectroscopy Study on the Valence State in alpha- and beta-YbAlB4 at Low Temperatures and High Magnetic Fields

Abstract

Keywords

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