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arXiv 1704.06237cond-mat.mtrl-sci
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角分辨光电子能谱研究RSb（R = Y，Ce，Gd，Dy，Ho，Tm，Lu）的电子结构

Electronic structure of RSb (R = Y, Ce, Gd, Dy, Ho, Tm, Lu) studied by angle-resolved photoemission spectroscopy

Yun Wu, Yongbin Lee, Tai Kong, Daixiang Mou, Rui Jiang, Lunan Huang, S. L. Bud'ko, P. C. Canfield, Adam Kaminski

备注：
8 figures
发表信息：
Phys. Rev. B 96, 035134 (2017)
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摘要：

利用高分辨角分辨光电子能谱（ARPES）和电子结构计算方法研究了稀土单锑化物RSb（R = Y，Ce，Gd，Dy，Ho，Tm，Lu）的电子性质。实验测得的RSb费米面（FS）在$Γ$点处由至少两个同心的空穴袋和在$X$点处的两个相交的电子袋组成。这些数据与电子结构计算结果吻合较好。详细的光子能量依赖性测量使用同步辐射和激光ARPES系统表明，至少有一个费米面片与强三维集中在$Γ$点。由于“镧系收缩”，不同稀土单锑化物的晶胞在稀土离子由CeSb转变为LuSb时收缩。这导致了这些化合物的化学势的差异，这是由ARPES测量和电子结构计算证明。有趣的是，在CeSb中，在$X$点处的交叉电子袋似乎接触到价带，形成四重简并的Dirac-like特征。另一方面，剩余的稀土单锑化物在$X$点处的上带和下带之间显示出显著的间隙。此外，类似于先前报道的LaBi的结果，在YSb、CeSb和GdSb中的$Γ$点处观察到Dirac-like结构，这些化合物显示出相对高的磁阻。这种Dirac结构可能有助于在这些化合物中的异常大的磁阻。

英文摘要：

We use high resolution angle-resolved photoemission spectroscopy (ARPES) and electronic structure calculations to study the electronic properties of rare-earth monoantimonides RSb (R = Y, Ce, Gd, Dy, Ho, Tm, Lu). The experimentally measured Fermi surface (FS) of RSb consists of at least two concentric hole pockets at the $Γ$ point and two intersecting electron pockets at the $X$ point. These data agree relatively well with the electronic structure calculations. Detailed photon energy dependence measurements using both synchrotron and laser ARPES systems indicate that there is at least one Fermi surface sheet with strong three-dimensionality centered at the $Γ$ point. Due to the "lanthanide contraction", the unit cell of different rare-earth monoantimonides shrinks when changing rare-earth ion from CeSb to LuSb. This results in the differences in the chemical potentials in these compounds, which is demonstrated by both ARPES measurements and electronic structure calculations. Interestingly, in CeSb, the intersecting electron pockets at the $X$ point seem to be touching the valence bands, forming a four-fold degenerate Dirac-like feature. On the other hand, the remaining rare-earth monoantimonides show significant gaps between the upper and lower bands at the $X$ point. Furthermore, similar to the previously reported results of LaBi, a Dirac-like structure was observed at the $Γ$ point in YSb, CeSb, and GdSb, compounds showing relatively high magnetoresistance. This Dirac-like structure may contribute to the unusually large magnetoresistance in these compounds.

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