Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Impurity-Induced Electronic Nematic State in Iron-Pnictide
  Superconductors   We propose that impurity-induced electronic nematic state is realized above
the orthorhombic structure transition temperature $T_S$ in iron-pnictide
superconductors. In the presence of strong orbital fluctuations near $T_S$, it
is theoretically revealed that a single impurity induces non-local orbital
order with $C_2$-symmetry, consistently with recent STM/STS measurements. Each
impurity-induced $C_2$ orbital order aligns along a-axis by applying tiny
uniaxial pressure along b-axis. In this impurity-induced nematic phase, the
resistivity shows sizable in-plane anisotropy ($\rho_b/\rho_a \sim 2$) even
above $T_S$, actually observed in various "detwinned" samples. The present
study indicates the existence of strong orbital fluctuations in iron-pnictide
superconductors.

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The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-ex
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The categories of this paper are: econ
9
The categories of this paper are: nlin
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The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: dg-ga
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The categories of this paper are: adap-org
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The categories of this paper are: bayes-an
8
The categories of this paper are: hep-ex
2
The categories of this paper are: math