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Title: Random strain induced correlations in materials with intertwined nematic and magnetic orders

Abstract

Electronic nematicity is rarely observed as an isolated instability of a correlated electron system. Instead, in iron pnictides and in certain cuprates and heavy-fermion materials, nematicity is intertwined with an underlying spin-stripe or charge-stripe state. As a result, random strain, ubiquitous in any real crystal, creates both random-field disorder for the nematic degrees of freedom and random-bond disorder for the spin or charge ones. Here, we put forward an Ashkin-Teller model with random Baxter fields to capture the dual role of random strain in nematic systems for which nematicity is a composite order arising from a stripe state. Using Monte Carlo to simulate this random Baxter-field model, we find not only the expected break-up of the system into nematic domains, but also the emergence of nontrivial disorder-promoted magnetic correlations. Such correlations enhance and tie up the fluctuations associated with the two degenerate magnetic stripe states from which nematicity arises, leaving characteristic signatures in the spatial profile of the magnetic domains, in the configurational space of the spin variables, and in the magnetic noise spectrum. We discuss possible experimental manifestations of these effects in iron-pnictide superconductors. Furthermore, our work establishes the random Baxter-field model as a more complete alternative to themore » random-field Ising model to describe complex electronic nematic phenomena in the presence of disorder.« less

Authors:
ORCiD logo [1]; ORCiD logo [2];  [1]
  1. Univ. of Minnesota, Minneapolis, MN (United States)
  2. Missouri Univ. of Science and Technology, Rolla, MO (United States)
Publication Date:
Research Org.:
Univ. of Minnesota, Minneapolis, MN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Science Foundation (NSF)
OSTI Identifier:
1961326
Grant/Contract Number:  
SC0020045; DMR1828489; NSF PHY-1748958
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review. B
Additional Journal Information:
Journal Volume: 106; 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; Charge density waves; Magnetic order; Nematic order; Spin density waves; Disordered systems; Iron-based superconductors; Strongly correlated systems; Unconventional superconductors; Monte Carlo methods; Random field Ising model

Citation Formats

Meese, W. Joe, Vojta, Thomas, and Fernandes, Rafael M. Random strain induced correlations in materials with intertwined nematic and magnetic orders. United States: N. p., 2022. Web. doi:10.1103/physrevb.106.115134.
Meese, W. Joe, Vojta, Thomas, & Fernandes, Rafael M. Random strain induced correlations in materials with intertwined nematic and magnetic orders. United States. https://doi.org/10.1103/physrevb.106.115134
Meese, W. Joe, Vojta, Thomas, and Fernandes, Rafael M. Mon . "Random strain induced correlations in materials with intertwined nematic and magnetic orders". United States. https://doi.org/10.1103/physrevb.106.115134. https://www.osti.gov/servlets/purl/1961326.
@article{osti_1961326,
title = {Random strain induced correlations in materials with intertwined nematic and magnetic orders},
author = {Meese, W. Joe and Vojta, Thomas and Fernandes, Rafael M.},
abstractNote = {Electronic nematicity is rarely observed as an isolated instability of a correlated electron system. Instead, in iron pnictides and in certain cuprates and heavy-fermion materials, nematicity is intertwined with an underlying spin-stripe or charge-stripe state. As a result, random strain, ubiquitous in any real crystal, creates both random-field disorder for the nematic degrees of freedom and random-bond disorder for the spin or charge ones. Here, we put forward an Ashkin-Teller model with random Baxter fields to capture the dual role of random strain in nematic systems for which nematicity is a composite order arising from a stripe state. Using Monte Carlo to simulate this random Baxter-field model, we find not only the expected break-up of the system into nematic domains, but also the emergence of nontrivial disorder-promoted magnetic correlations. Such correlations enhance and tie up the fluctuations associated with the two degenerate magnetic stripe states from which nematicity arises, leaving characteristic signatures in the spatial profile of the magnetic domains, in the configurational space of the spin variables, and in the magnetic noise spectrum. We discuss possible experimental manifestations of these effects in iron-pnictide superconductors. Furthermore, our work establishes the random Baxter-field model as a more complete alternative to the random-field Ising model to describe complex electronic nematic phenomena in the presence of disorder.},
doi = {10.1103/physrevb.106.115134},
journal = {Physical Review. B},
number = 11,
volume = 106,
place = {United States},
year = {Mon Sep 19 00:00:00 EDT 2022},
month = {Mon Sep 19 00:00:00 EDT 2022}
}

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