论文标题
固定价值$β$ -lualb $ _4 $的电子结构中的强面内各向异性
Strong in-plane anisotropy in the electronic structure of fixed-valence $β$-LuAlB$_4$
论文作者
论文摘要
在重铁剂超导体$β$ -YBALB $ _4 $中，内在量子关键的起源归因于强YB价波动及其特殊的晶体结构。在这里，我们通过研究同生的但固定价化合物$β$ -lualb $ _4 $来评估这些贡献。量子振荡测量和DFT计算显示，费米表面与$β$ -YBALB $ _4 $明显不同，与那里的“大”费米表面一致。与$β$ -YBALB $ _4 $的各向同性近代杂交相比，我们还发现了电子结构的意外面内各向异性。
The origin of intrinsic quantum criticality in the heavy-fermion superconductor $β$-YbAlB$_4$ has been attributed to strong Yb valence fluctuations and its peculiar crystal structure. Here, we assess these contributions individually by studying the isostructural but fixed-valence compound $β$-LuAlB$_4$. Quantum oscillation measurements and DFT calculations reveal a Fermi surface markedly different from that of $β$-YbAlB$_4$, consistent with a `large' Fermi surface there. We also find an unexpected in-plane anisotropy of the electronic structure, in contrast to the isotropic Kondo hybridization in $β$-YbAlB$_4$.
