Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Anomalous lattice contraction and emergent electronic phases in Bi-doped
  Eu$_2$Ir$_2$O$_7$   We study the pyrochlore series (Eu$_{1-x}$Bi$_x$)$_2$Ir$_2$O$_7$ for $ 0 \leq
x \leq 1$. We show that for small $x$, the lattice undergoes an anomalous
contraction but the all-in/all-out and metal-to-insulator transitions remain
robust, and the resistivity approaches a $1/T$ dependence at low-T, suggesting
proximity to the Weyl semimetallic phase, as previously predicted
theoretically. At the boundary between Eu$_2$Ir$_2$O$_7$ and Bi$_2$Ir$_2$O$_7$
a qualitatively different ground state emerges, which is characterized by its
unusual metallic behavior and absence of magnetic ordering at least down to
$0.02$ K.

11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
16
The categories of this paper are: stat
6
The categories of this paper are: astro-ph
26
The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess