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Title: Evidence for the weakly coupled electron mechanism in an Anderson-Blount polar metal

Abstract

Over 50 years ago, Anderson and Blount proposed that ferroelectric-like structural phase transitions may occur in metals, despite the expected screening of the Coulomb interactions that often drive polar transitions. Recently, theoretical treatments have suggested that such transitions require the itinerant electrons be decoupled from the soft transverse optical phonons responsible for polar order. However, this decoupled electron mechanism (DEM) has yet to be experimentally observed. Here we utilize ultrafast spectroscopy to uncover evidence of the DEM in LiOsO 3, the first known band metal to undergo a thermally driven polar phase transition (T c ≈ 140 K). We demonstrate that intra-band photo-carriers relax by selectively coupling to only a subset of the phonon spectrum, leaving as much as 60% of the lattice heat capacity decoupled. This decoupled heat capacity is shown to be consistent with a previously undetected and partially displacive TO polar mode, indicating the DEM in LiOsO 3.

Authors:
 [1];  [1]; ORCiD logo [1];  [2];  [2]; ORCiD logo [3];  [4]; ORCiD logo [2];  [1]
  1. California Inst. of Technology (CalTech), Pasadena, CA (United States)
  2. Northwestern Univ., Evanston, IL (United States)
  3. National Inst. for Materials Science (NIMS), Tsukuba (Japan)
  4. Chinese Academy of Sciences (CAS), Beijing (China)
Publication Date:
Research Org.:
California Inst. of Technology (CalTech), Pasadena, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1597627
Grant/Contract Number:  
[SC0010533]
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
[ Journal Volume: 10; 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

Laurita, N. J., Ron, A., Shan, Jun-Yi, Puggioni, D., Koocher, N. Z., Yamaura, K., Shi, Y., Rondinelli, J. M., and Hsieh, D. Evidence for the weakly coupled electron mechanism in an Anderson-Blount polar metal. United States: N. p., 2019. Web. doi:10.1038/s41467-019-11172-2.
Laurita, N. J., Ron, A., Shan, Jun-Yi, Puggioni, D., Koocher, N. Z., Yamaura, K., Shi, Y., Rondinelli, J. M., & Hsieh, D. Evidence for the weakly coupled electron mechanism in an Anderson-Blount polar metal. United States. doi:10.1038/s41467-019-11172-2.
Laurita, N. J., Ron, A., Shan, Jun-Yi, Puggioni, D., Koocher, N. Z., Yamaura, K., Shi, Y., Rondinelli, J. M., and Hsieh, D. Fri . "Evidence for the weakly coupled electron mechanism in an Anderson-Blount polar metal". United States. doi:10.1038/s41467-019-11172-2. https://www.osti.gov/servlets/purl/1597627.
@article{osti_1597627,
title = {Evidence for the weakly coupled electron mechanism in an Anderson-Blount polar metal},
author = {Laurita, N. J. and Ron, A. and Shan, Jun-Yi and Puggioni, D. and Koocher, N. Z. and Yamaura, K. and Shi, Y. and Rondinelli, J. M. and Hsieh, D.},
abstractNote = {Over 50 years ago, Anderson and Blount proposed that ferroelectric-like structural phase transitions may occur in metals, despite the expected screening of the Coulomb interactions that often drive polar transitions. Recently, theoretical treatments have suggested that such transitions require the itinerant electrons be decoupled from the soft transverse optical phonons responsible for polar order. However, this decoupled electron mechanism (DEM) has yet to be experimentally observed. Here we utilize ultrafast spectroscopy to uncover evidence of the DEM in LiOsO3, the first known band metal to undergo a thermally driven polar phase transition (Tc ≈ 140 K). We demonstrate that intra-band photo-carriers relax by selectively coupling to only a subset of the phonon spectrum, leaving as much as 60% of the lattice heat capacity decoupled. This decoupled heat capacity is shown to be consistent with a previously undetected and partially displacive TO polar mode, indicating the DEM in LiOsO3.},
doi = {10.1038/s41467-019-11172-2},
journal = {Nature Communications},
number = [1],
volume = [10],
place = {United States},
year = {2019},
month = {7}
}

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