Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Strong in-plane anisotropy in the electronic structure of fixed-valence
  $\beta$-LuAlB$_4$   The origin of intrinsic quantum criticality in the heavy-fermion
superconductor $\beta$-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 $\beta$-LuAlB$_4$. Quantum oscillation measurements and DFT
calculations reveal a Fermi surface markedly different from that of
$\beta$-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 $\beta$-YbAlB$_4$.

6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph