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.
Copyright Owner
American Physical Society
Copyright Date
2017
Language
en
File Format
application/pdf
Recommended Citation
Chinotti, Manuel; Pal, Anirban; Degiorgi, Leonardo; Böhmer, Anna E.; and Canfield, Paul C., "Optical anisotropy in the electronic nematic phase of FeSe" (2017). Physics and Astronomy Publications. 538.
https://lib.dr.iastate.edu/physastro_pubs/538
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.