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Title: A parity-breaking electronic nematic phase transition in the spin-orbit coupled metal Cd 2Re 2O 7

Strong electron interactions can drive metallic systems toward a variety of well-known symmetry-broken phases, but the instabilities of correlated metals with strong spin-orbit coupling have only recently begun to be explored. We uncovered a multipolar nematic phase of matter in the metallic pyrochlore Cd 2Re 2O 7 using spatially resolved second-harmonic optical anisotropy measurements. Like previously discovered electronic nematic phases, this multipolar phase spontaneously breaks rotational symmetry while preserving translational invariance. However, it has the distinguishing property of being odd under spatial inversion, which is allowed only in the presence of spin-orbit coupling. By examining the critical behavior of the multipolar nematic order parameter, we show that it drives the thermal phase transition near 200 kelvin in Cd 2Re 2O 7 and induces a parity-breaking lattice distortion as a secondary order.
Authors:
ORCiD logo [1] ; ORCiD logo [2] ;  [2] ; ORCiD logo [2] ; ORCiD logo [1]
  1. California Inst. of Technology (CalTech), Pasadena, CA (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Science
Additional Journal Information:
Journal Volume: 356; Journal Issue: 6335; Journal ID: ISSN 0036-8075
Publisher:
AAAS
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1376525

Harter, J. W., Zhao, Z. Y., Yan, J. -Q., Mandrus, D. G., and Hsieh, D.. A parity-breaking electronic nematic phase transition in the spin-orbit coupled metal Cd2Re2O7. United States: N. p., Web. doi:10.1126/science.aad1188.
Harter, J. W., Zhao, Z. Y., Yan, J. -Q., Mandrus, D. G., & Hsieh, D.. A parity-breaking electronic nematic phase transition in the spin-orbit coupled metal Cd2Re2O7. United States. doi:10.1126/science.aad1188.
Harter, J. W., Zhao, Z. Y., Yan, J. -Q., Mandrus, D. G., and Hsieh, D.. 2017. "A parity-breaking electronic nematic phase transition in the spin-orbit coupled metal Cd2Re2O7". United States. doi:10.1126/science.aad1188. https://www.osti.gov/servlets/purl/1376525.
@article{osti_1376525,
title = {A parity-breaking electronic nematic phase transition in the spin-orbit coupled metal Cd2Re2O7},
author = {Harter, J. W. and Zhao, Z. Y. and Yan, J. -Q. and Mandrus, D. G. and Hsieh, D.},
abstractNote = {Strong electron interactions can drive metallic systems toward a variety of well-known symmetry-broken phases, but the instabilities of correlated metals with strong spin-orbit coupling have only recently begun to be explored. We uncovered a multipolar nematic phase of matter in the metallic pyrochlore Cd2Re2O7 using spatially resolved second-harmonic optical anisotropy measurements. Like previously discovered electronic nematic phases, this multipolar phase spontaneously breaks rotational symmetry while preserving translational invariance. However, it has the distinguishing property of being odd under spatial inversion, which is allowed only in the presence of spin-orbit coupling. By examining the critical behavior of the multipolar nematic order parameter, we show that it drives the thermal phase transition near 200 kelvin in Cd2Re2O7 and induces a parity-breaking lattice distortion as a secondary order.},
doi = {10.1126/science.aad1188},
journal = {Science},
number = 6335,
volume = 356,
place = {United States},
year = {2017},
month = {4}
}