Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Elasto-Raman scattering: arsenic optical phonon as a probe of nematicity
  in BaFe$_2$As$_2$   We report a Raman scattering study of nematic degrees of freedom in the
iron-based superconductor parent compound BaFe$_2$As$_2$ under tunable uniaxial
strain. We demonstrate that the polarization resolved arsenic (As) phonon
intensity can be used to monitor the nematic order parameter as a function of
both temperature and strain. At low temperature in the nematic ordered phase we
use it to track the continuous and reversible orientation of nematic domains
under variable strain. At higher temperature, the evolution of the As phonon
intensity under strain reflects an enhanced nematic susceptibility close to the
nematic transition $T_S$. Its temperature dependence under strong strain
follows qualitatively the expected behavior of an Ising order parameter under a
symmetry breaking field. Our elasto-Raman study illustrates the interest of
combining selective anisotropic strain with a symmetry resolved probe like
Raman scattering. Elasto-Raman scattering can be applied to a wide variety of
quantum materials where uniaxial strain tunes electronic orders.

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The categories of this paper are: chem-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: nlin
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The categories of this paper are: astro-ph
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The categories of this paper are: supr-con
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The categories of this paper are: plasm-ph
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The categories of this paper are: econ
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The categories of this paper are: cs
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The categories of this paper are: cmp-lg
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The categories of this paper are: eess
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The categories of this paper are: q-alg
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The categories of this paper are: nucl-th
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The categories of this paper are: comp-gas
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The categories of this paper are: funct-an
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The categories of this paper are: solv-int
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The categories of this paper are: q-fin