Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Elastoresistive and Elastocaloric Anomalies at Magnetic and
  Electronic-Nematic Critical Points   Using Ba(Fe$_{0.975}$Co$_{0.025}$)$_2$As$_{2}$ as an exemplar material
exhibiting second order electronic-nematic and antiferromagnetic transitions,
we present measurements that reveal anomalies in the elastoresistance
$\left(\frac{\partial \rho_{ij}}{\partial\varepsilon_{kl}}\right)$ and
elastocaloric effect $\left(\frac{\partial T}{\partial\varepsilon_{kl}}\right)$
at both phase transitions. Both effects are understood to arise from the effect
of strain on the transition temperatures; in the region close to the phase
transitions this leads to (1) similarity between the strain and temperature
derivatives of the resistivity and (2) similarity between the elastocaloric
effect and the singular part of the specific heat. These mechanisms for
elastoresistance and elastocaloric effect should be anticipated for any
material in which mechanical deformation changes the transition temperature.
Furthermore, these measurements provide evidence that the Fisher-Langer
relation $\rho^{(c)} \propto U^{(c)}$ between the scattering from critical
degrees of freedom and their energy-density, respectively, holds near each of
the Ne\'{e}l and electronic nematic transitions in the material studied.

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The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex
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The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
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The categories of this paper are: nlin
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
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The categories of this paper are: cs
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The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph