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Title: Cooperative elastic fluctuations provide tuning of the metal–insulator transition

Abstract

Metal-to-insulator transitions driven by strong electronic correlations occur frequently in condensed matter systems, and are associated with remarkable collective phenomena in solids, including superconductivity and magnetism. Tuning and control of the transition holds the promise of low-power, ultrafast electronics, but the relative roles of doping, chemistry, elastic strain and other applied fields have made systematic understanding of such transitions difficult. Here we show that existing data on the tuning of metal-to-insulator transitions in perovskite transition-metal oxides through ionic size effects provides evidence of large systematic effects on the phase transition owing to dynamical fluctuations of the elastic strain, which have usually been neglected. Here, we illustrate this using a simple yet quantitative statistical mechanical calculation in a model that incorporates cooperative lattice distortions coupled to the electronic degrees of freedom. We reproduce the observed dependence of the transition temperature on the cation radius in the well studied manganite and nickelate materials. Because elastic couplings are generally strong, we anticipate that these conclusions will generalize to all metal-to-insulator transitions that couple to a change in lattice symmetry.

Authors:
 [1];  [2];  [3]
  1. Univ. de Costa Rica, San José (Costa Rica); Argonne National Lab. (ANL), Argonne, IL (United States)
  2. Yale Univ., New Haven, CT (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Chicago, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
OSTI Identifier:
1591763
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Nature (London)
Additional Journal Information:
Journal Name: Nature (London); Journal Volume: 576; Journal Issue: 7787; Journal ID: ISSN 0028-0836
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Guzmán-Verri, Gian G., Brierley, Richard T., and Littlewood, Peter B. Cooperative elastic fluctuations provide tuning of the metal–insulator transition. United States: N. p., 2019. Web. doi:10.1038/s41586-019-1824-9.
Guzmán-Verri, Gian G., Brierley, Richard T., & Littlewood, Peter B. Cooperative elastic fluctuations provide tuning of the metal–insulator transition. United States. doi:https://doi.org/10.1038/s41586-019-1824-9
Guzmán-Verri, Gian G., Brierley, Richard T., and Littlewood, Peter B. Wed . "Cooperative elastic fluctuations provide tuning of the metal–insulator transition". United States. doi:https://doi.org/10.1038/s41586-019-1824-9. https://www.osti.gov/servlets/purl/1591763.
@article{osti_1591763,
title = {Cooperative elastic fluctuations provide tuning of the metal–insulator transition},
author = {Guzmán-Verri, Gian G. and Brierley, Richard T. and Littlewood, Peter B.},
abstractNote = {Metal-to-insulator transitions driven by strong electronic correlations occur frequently in condensed matter systems, and are associated with remarkable collective phenomena in solids, including superconductivity and magnetism. Tuning and control of the transition holds the promise of low-power, ultrafast electronics, but the relative roles of doping, chemistry, elastic strain and other applied fields have made systematic understanding of such transitions difficult. Here we show that existing data on the tuning of metal-to-insulator transitions in perovskite transition-metal oxides through ionic size effects provides evidence of large systematic effects on the phase transition owing to dynamical fluctuations of the elastic strain, which have usually been neglected. Here, we illustrate this using a simple yet quantitative statistical mechanical calculation in a model that incorporates cooperative lattice distortions coupled to the electronic degrees of freedom. We reproduce the observed dependence of the transition temperature on the cation radius in the well studied manganite and nickelate materials. Because elastic couplings are generally strong, we anticipate that these conclusions will generalize to all metal-to-insulator transitions that couple to a change in lattice symmetry.},
doi = {10.1038/s41586-019-1824-9},
journal = {Nature (London)},
number = 7787,
volume = 576,
place = {United States},
year = {2019},
month = {12}
}

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