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Title: Ingredients for the electronic nematic phase in FeSe revealed by its anisotropic optical response

Abstract

The origin of the anisotropy in physical quantities related to a symmetry-broken (nematic) electronic state is still very much debated in high-temperature superconductors. FeSe at ambient pressure undergoes a structural, tetragonal-to-orthorhombic phase transition at T s ≃ 90 K without any magnetic ordering on further cooling, which leads to an ideal electronic nematicity. Our unprecedented optical results provide evidence that the low-energy excitation spectrum in the nematic phase is shaped by an important interplay of the anisotropic Drude weight and scattering rate. In the zero-frequency limit though, the temperature dependence of the anisotropic scattering rate plays the dominant role and, combined with the nematic order parameter as evinced from the high energy optical response, accounts for the anisotropic dc resistivity. In conclusion, this favors the scattering by anisotropic spin fluctuations as the prominent candidate in governing the properties of the nematic phase.

Authors:
 [1];  [1];  [1];  [2];  [3]
  1. ETH - Zurich, Zurich (Switzerland)
  2. Ames Lab., Ames, IA (United States); Karlsruhe Institute for Technology, Karlsruhe (Germany)
  3. Ames Lab., Ames, IA (United States)
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1466330
Alternate Identifier(s):
OSTI ID: 1468871
Report Number(s):
IS-J-9734
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:  
AC02-07CH11358
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 98; Journal Issue: 9; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Chinotti, M., Pal, A., Degiorgi, L., Böhmer, A. E., and Canfield, P. C. Ingredients for the electronic nematic phase in FeSe revealed by its anisotropic optical response. United States: N. p., 2018. Web. doi:10.1103/PhysRevB.98.094506.
Chinotti, M., Pal, A., Degiorgi, L., Böhmer, A. E., & Canfield, P. C. Ingredients for the electronic nematic phase in FeSe revealed by its anisotropic optical response. United States. doi:10.1103/PhysRevB.98.094506.
Chinotti, M., Pal, A., Degiorgi, L., Böhmer, A. E., and Canfield, P. C. Thu . "Ingredients for the electronic nematic phase in FeSe revealed by its anisotropic optical response". United States. doi:10.1103/PhysRevB.98.094506. https://www.osti.gov/servlets/purl/1466330.
@article{osti_1466330,
title = {Ingredients for the electronic nematic phase in FeSe revealed by its anisotropic optical response},
author = {Chinotti, M. and Pal, A. and Degiorgi, L. and Böhmer, A. E. and Canfield, P. C.},
abstractNote = {The origin of the anisotropy in physical quantities related to a symmetry-broken (nematic) electronic state is still very much debated in high-temperature superconductors. FeSe at ambient pressure undergoes a structural, tetragonal-to-orthorhombic phase transition at Ts ≃ 90 K without any magnetic ordering on further cooling, which leads to an ideal electronic nematicity. Our unprecedented optical results provide evidence that the low-energy excitation spectrum in the nematic phase is shaped by an important interplay of the anisotropic Drude weight and scattering rate. In the zero-frequency limit though, the temperature dependence of the anisotropic scattering rate plays the dominant role and, combined with the nematic order parameter as evinced from the high energy optical response, accounts for the anisotropic dc resistivity. In conclusion, this favors the scattering by anisotropic spin fluctuations as the prominent candidate in governing the properties of the nematic phase.},
doi = {10.1103/PhysRevB.98.094506},
journal = {Physical Review B},
number = 9,
volume = 98,
place = {United States},
year = {2018},
month = {9}
}

Journal Article:
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Cited by: 2 works
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Figures / Tables:

FIG. 1 FIG. 1: Experimental setup as well as T and p dependence of the optical anisotropy: The upper-left panel schematically shows a sample inside the mechanical device and emphasizes the orientation of its a- and b-axis with respect to the direction of the applied stress p. Polarized light parallel to themore » orthorhombic (elongated) a- and (short) b-axis (in our experimental set-up Pol 90 and Pol 0, respectively) illuminates the sample. (a) Representative data of the optical reflectivity (R(ω)) of FeSe at 10 K for p = 1.2 bar (i.e., at saturation) after a ZPC experiment; it emphasizes the previously discussed optical anisotropy at mid-infrared frequencies. The inset shows Ra(ω) and Rb(ω) from the far-infrared up to the ultraviolet range with a logarithmic frequency scale. (b) Real part σ1(ω) of the optical conductivity and its blow up pertinent to the far-infrared range (inset) at 10 K for p = 1.2 bar. (c)-(e) T dependence of the dichroism defined as ∆σ1(ω) = σ$^{a}_{1}$ (ω) − σ$^{b}_{1}$ (ω) at 0, 1.2 and released 0 bar after the p-loop experiment. The thick horizontal dashed line marks Ts. The thin vertical dotted lines in panels (a) and (d) mark the frequencies 1000 and 3000 cm−1. (f)-(i) ∆σ1(ω) at selected T below and above Ts within each p-loop experiments. The thin horizontal dashed line marks p = 1.2 bar (i.e., at saturation). A first-neighbor interpolation procedure is used in order to generate the color maps. Released p is denoted by ’(r)’.« less

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