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Title: Resistivity near a nematic quantum critical point: Impact of acoustic phonons

Abstract

We revisit the issue of the resistivity of a two-dimensional electronic system tuned to a nematic quantum critical point (QCP), focusing on the nontrivial impact of the coupling to the acoustic phonons. Due to the unavoidable linear coupling between the electronic nematic order parameter and the lattice strain fields, long-range nematic interactions mediated by the phonons emerge in the problem. By solving the semiclassical Boltzmann equation in the presence of scattering by impurities and nematic fluctuations, we determine the temperature dependence of the resistivity as the nematic QCP is approached. One of the main effects of the nematoelastic coupling is to smooth the electronic nonequilibrium distribution function, making it approach the simple cosine angular dependence even when the impurity scattering is not too strong. We find that at temperatures lower than a temperature scale set by the nematoelastic coupling, the resistivity shows the T2 behavior characteristic of a Fermi liquid. This is in contrast to the T4/3 low-temperature behavior expected for a lattice-free nematic quantum critical point. More importantly, we show that the effective resistivity exponent αeff(T) in ρ(T) – ρ0 ~ Tαeff(T) displays a pronounced temperature dependence, implying that a nematic QCP cannot generally be characterized by a simplemore » resistivity exponent. Furthermore, we discuss the implications of our results to the interpretation of experimental data, particularly in the nematic superconductor FeSe1–xSx.« less

Authors:
ORCiD logo [1];  [2]
  1. Univ. of Minnesota, Minneapolis, MN (United States); Inst. de Física Gleb Wataghin, Sao Paulo (Brazil)
  2. Univ. of Minnesota, Minneapolis, MN (United States)
Publication Date:
Research Org.:
Univ. of Minnesota, Minneapolis, MN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1611765
Alternate Identifier(s):
OSTI ID: 1560318
Grant/Contract Number:  
SC0012336
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review. B
Additional Journal Information:
Journal Volume: 100; Journal Issue: 11; 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; Materials Science; Physics; Superconductivity; Strongly correlated systems; Non-Fermi-liquid theory

Citation Formats

de Carvalho, V. S., and Fernandes, R. M. Resistivity near a nematic quantum critical point: Impact of acoustic phonons. United States: N. p., 2019. Web. doi:10.1103/physrevb.100.115103.
de Carvalho, V. S., & Fernandes, R. M. Resistivity near a nematic quantum critical point: Impact of acoustic phonons. United States. https://doi.org/10.1103/physrevb.100.115103
de Carvalho, V. S., and Fernandes, R. M. Tue . "Resistivity near a nematic quantum critical point: Impact of acoustic phonons". United States. https://doi.org/10.1103/physrevb.100.115103. https://www.osti.gov/servlets/purl/1611765.
@article{osti_1611765,
title = {Resistivity near a nematic quantum critical point: Impact of acoustic phonons},
author = {de Carvalho, V. S. and Fernandes, R. M.},
abstractNote = {We revisit the issue of the resistivity of a two-dimensional electronic system tuned to a nematic quantum critical point (QCP), focusing on the nontrivial impact of the coupling to the acoustic phonons. Due to the unavoidable linear coupling between the electronic nematic order parameter and the lattice strain fields, long-range nematic interactions mediated by the phonons emerge in the problem. By solving the semiclassical Boltzmann equation in the presence of scattering by impurities and nematic fluctuations, we determine the temperature dependence of the resistivity as the nematic QCP is approached. One of the main effects of the nematoelastic coupling is to smooth the electronic nonequilibrium distribution function, making it approach the simple cosine angular dependence even when the impurity scattering is not too strong. We find that at temperatures lower than a temperature scale set by the nematoelastic coupling, the resistivity shows the T2 behavior characteristic of a Fermi liquid. This is in contrast to the T4/3 low-temperature behavior expected for a lattice-free nematic quantum critical point. More importantly, we show that the effective resistivity exponent αeff(T) in ρ(T) – ρ0 ~ Tαeff(T) displays a pronounced temperature dependence, implying that a nematic QCP cannot generally be characterized by a simple resistivity exponent. Furthermore, we discuss the implications of our results to the interpretation of experimental data, particularly in the nematic superconductor FeSe1–xSx.},
doi = {10.1103/physrevb.100.115103},
journal = {Physical Review. B},
number = 11,
volume = 100,
place = {United States},
year = {Tue Sep 03 00:00:00 EDT 2019},
month = {Tue Sep 03 00:00:00 EDT 2019}
}

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Works referencing / citing this record:

Quenched nematic criticality and two superconducting domes in an iron-based superconductor
journal, October 2019