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Title: Experimental evidence for bipolaron condensation as a mechanism for the metal-insulator transition in rare-earth nickelates

Abstract

Many-body effects produce deviations from the predictions of conventional band theory in quantum materials, leading to strongly correlated phases with insulating or bad metallic behavior. One example is the rare-earth nickelates RNiO 3, which undergo metal-to-insulator transitions (MITs) whose origin is debated. Here, we combine total neutron scattering and broadband dielectric spectroscopy experiments to study and compare carrier dynamics and local crystal structure in LaNiO 3 and NdNiO 3. We find that the local crystal structure of both materials is distorted in the metallic phase, with slow, thermally activated carrier dynamics at high temperature. We further observe a sharp change in conductivity across the MIT in NdNiO 3, accompanied by slight differences in the carrier hopping time. Here, these results suggest that changes in carrier concentration drive the MIT through a polaronic mechanism, where the (bi)polaron liquid freezes into the insulating phase across the MIT temperature.

Authors:
 [1];  [1];  [1];  [1];  [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [1]
  1. The Univ. of Tennessee, Knoxville, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Instituto de Ciencia de Materiales de Madrid, Madrid (Spain)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1484150
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 9; Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Shamblin, Jacob, Heres, Maximilian, Zhou, Haidong, Sangoro, Joshua, Lang, Maik, Neuefeind, Joerg, Alonso, J. A., and Johnston, Steven. Experimental evidence for bipolaron condensation as a mechanism for the metal-insulator transition in rare-earth nickelates. United States: N. p., 2018. Web. doi:10.1038/s41467-017-02561-6.
Shamblin, Jacob, Heres, Maximilian, Zhou, Haidong, Sangoro, Joshua, Lang, Maik, Neuefeind, Joerg, Alonso, J. A., & Johnston, Steven. Experimental evidence for bipolaron condensation as a mechanism for the metal-insulator transition in rare-earth nickelates. United States. doi:10.1038/s41467-017-02561-6.
Shamblin, Jacob, Heres, Maximilian, Zhou, Haidong, Sangoro, Joshua, Lang, Maik, Neuefeind, Joerg, Alonso, J. A., and Johnston, Steven. Mon . "Experimental evidence for bipolaron condensation as a mechanism for the metal-insulator transition in rare-earth nickelates". United States. doi:10.1038/s41467-017-02561-6. https://www.osti.gov/servlets/purl/1484150.
@article{osti_1484150,
title = {Experimental evidence for bipolaron condensation as a mechanism for the metal-insulator transition in rare-earth nickelates},
author = {Shamblin, Jacob and Heres, Maximilian and Zhou, Haidong and Sangoro, Joshua and Lang, Maik and Neuefeind, Joerg and Alonso, J. A. and Johnston, Steven},
abstractNote = {Many-body effects produce deviations from the predictions of conventional band theory in quantum materials, leading to strongly correlated phases with insulating or bad metallic behavior. One example is the rare-earth nickelates RNiO3, which undergo metal-to-insulator transitions (MITs) whose origin is debated. Here, we combine total neutron scattering and broadband dielectric spectroscopy experiments to study and compare carrier dynamics and local crystal structure in LaNiO3 and NdNiO3. We find that the local crystal structure of both materials is distorted in the metallic phase, with slow, thermally activated carrier dynamics at high temperature. We further observe a sharp change in conductivity across the MIT in NdNiO3, accompanied by slight differences in the carrier hopping time. Here, these results suggest that changes in carrier concentration drive the MIT through a polaronic mechanism, where the (bi)polaron liquid freezes into the insulating phase across the MIT temperature.},
doi = {10.1038/s41467-017-02561-6},
journal = {Nature Communications},
number = 1,
volume = 9,
place = {United States},
year = {Mon Jan 08 00:00:00 EST 2018},
month = {Mon Jan 08 00:00:00 EST 2018}
}

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Works referenced in this record:

Metal-insulator transitions
journal, October 1998

  • Imada, Masatoshi; Fujimori, Atsushi; Tokura, Yoshinori
  • Reviews of Modern Physics, Vol. 70, Issue 4, p. 1039-1263
  • DOI: 10.1103/RevModPhys.70.1039