Synchrotron X-ray spectroscopy study on the valence state in α- and β-YbAlB4 at low temperatures and high magnetic fields
Synchrotron X-ray spectroscopy study on the valence state in α- and β-YbAlB4 at low temperatures and high magnetic fields
复制标题
DOI：
10.3938/jkps.62.1778
复制
发表时间：
2013-07-01
影响因子：
0.6
通讯作者：
Mizumaki, M.
中科院分区：
文献类型：
--
作者：
Matsuda, Y. H.;Nakamura, T.;Mizumaki, M.
用X射线吸收和发射光谱研究了β-YbAlB4及其晶型α-YbAlB4中Yb离子在2~280K温度下的价态，用X射线发射光谱观察到2K时Yb价态为2.78+/-0.01。随着温度的升高，YbAlB4的价态逐渐增加，价态起伏的特征温度约为290K。在40K下施加32T的磁场，Yb价有小幅增加(类似于0.002)。
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 alound a small increase in the Yb valence (similar to 0.002) by applying a magnetic field of 32 T at 40 K to beta-YbAlB4.so f