Anisotropic optical properties of detwinned BaFe2As2

Christopher C. Homes, Thomas Wolf, and Christoph Meingast
Phys. Rev. B 102, 155135 – Published 23 October 2020
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Abstract

The optical properties of a large, detwinned single crystal of BaFe2As2 have been examined over a wide frequency range above and below the structural and magnetic transition at TN138K. Above TN the real part of the optical conductivity and the two infrared-active lattice modes are almost completely isotropic; the lattice modes show a weak polarization dependence just above TN. For T<TN, the optical conductivity due to the free-carrier response is anisotropic, being larger along the a axis than the b axis below 30 meV; above this energy the optical conductivity is dominated by the interband contributions, which appear to be isotropic. The splitting of the low-energy infrared-active mode below TN is clearly observed, and the polarization modulation of the new modes may be used to estimate that the crystal is 70% detwinned. The high-frequency mode, with a threefold increase in strength of the lower branch below TN and the nearly silent upper branch, remains enigmatic.

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  • Received 3 July 2020
  • Accepted 30 September 2020

DOI:https://doi.org/10.1103/PhysRevB.102.155135

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Christopher C. Homes1,*, Thomas Wolf2, and Christoph Meingast2,†

  • 1Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory, Upton, New York 11973, USA
  • 2Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany

  • *homes@bnl.gov
  • christoph.meingast@kit.edu

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Issue

Vol. 102, Iss. 15 — 15 October 2020

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