Campus Units

Physics and Astronomy, Ames Laboratory

Document Type

Article

Publication Version

Published Version

Publication Date

9-15-2017

Journal or Book Title

Physical Review B

Volume

96

Issue

12

First Page

121112

DOI

10.1103/PhysRevB.96.121112

Abstract

At ambient pressure, FeSe undergoes a structural, tetragonal-to-orthorhombic, phase transition at Ts≃90 K without any magnetic ordering on further cooling. FeSe thus provides an arena for examining the nematic phase without the complications following the reconstruction of the Fermi surface due to the antiferromagnetic order within the orthorhombic state. We perform an optical-reflectivity investigation across the structural transition, as a function of uniaxial stress in order to detwin the specimen. These measurements reveal a hysteretic behavior of the anisotropic optical response to uniaxial stress for T≤Ts, which extends to energy scales of about 0.5 eV. The sign changes of the optical anisotropy between distinct energy intervals suggest a complex evolution of the polarized electronic structure in the nematic phase. The temperature dependence of the optical anisotropy for the fully detwinned specimen is furthermore acting as a proxy for the order parameter of nematicity.

Comments

This article is published as Chinotti, Manuel, Anirban Pal, Leonardo Degiorgi, Anna E. Böhmer, and Paul C. Canfield. "Optical anisotropy in the electronic nematic phase of FeSe." Physical Review B 96, no. 12 (2017): 121112. DOI: 10.1103/PhysRevB.96.121112. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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