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

被引：0
|
作者：
Y. H. Matsuda
T. Nakamura
K. Kuga
S. Nakatsuji
S. Michimura
T. Inami
N. Kawamura
M. Mizumaki
机构：
[1] University of Tokyo,Institute for Solid State Physics
[2] Japan Atomic Energy Agency,undefined
[3] SPring-8/Japan Synchrotron Radiation Research Institute,undefined
来源：
Journal of the Korean Physical Society | 2013年 / 62卷
关键词：
Valence fluctuation; Heavy fermion; High magnetic fields;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
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.
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页码：1778 / 1781
页数：3
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