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Elasto-Raman scattering: Arsenic optical phonon as a probe of nematicity in BaFe2As2

Jean-Côme Philippe, Jimmy Faria, Anne Forget, Dorothée Colson, Sarah Houver, Maximilien Cazayous, Alain Sacuto, and Yann Gallais
Phys. Rev. B 105, 024518 – Published 24 January 2022

Abstract

We report a Raman scattering study of nematic degrees of freedom in the iron-based superconductor parent compound BaFe2As2 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 temperatures, the evolution of the As phonon intensity under strain reflects an enhanced nematic susceptibility close to the nematic transition TS. Its temperature dependence under strong strain qualitatively follows 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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  • Received 12 October 2021
  • Revised 30 December 2021
  • Accepted 5 January 2022

DOI:https://doi.org/10.1103/PhysRevB.105.024518

©2022 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Jean-Côme Philippe1,*, Jimmy Faria1, Anne Forget2, Dorothée Colson2, Sarah Houver1, Maximilien Cazayous1, Alain Sacuto1, and Yann Gallais1,†

  • 1Université de Paris, Matériaux et Phénomènes Quantiques, CNRS, 75013 Paris, France
  • 2Service de Physique de l'Etat Condensé, DSM/DRECAM/SPEC, CEA Saclay, Gif-sur-Yvette, 91191, France

  • *jeancome.philippe@u-paris.fr
  • yann.gallais@u-paris.fr

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Issue

Vol. 105, Iss. 2 — 1 January 2022

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