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Title: Multiple Coulomb phase in the fluoride pyrochlore CsNiCrF 6

Abstract

The Coulomb phase is an idealized state of matter whose properties are determined by factors beyond conventional considerations of symmetry, including global topology, conservation laws and emergent order. In theory, Coulomb phases occur in ice-type systems such as water ice and spin ice; in dimer models; and in certain spin liquids. Yet, apart from ice-type systems, more general experimental examples are very scarce. Here we study the partly disordered material CsNiCrF 6 and show that this material is a multiple Coulomb phase with signature correlations in three degrees of freedom: charge configurations, atom displacements and spin configurations. We use neutron and X-ray scattering to separate these correlations and to determine the magnetic excitation spectrum. Our results reveal how the structural and magnetic properties of apparently disordered materials may inherit, and be dictated by, a hidden symmetry—the local gauge symmetry of an underlying Coulomb phase.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [3];  [1];  [4];  [4];  [4];  [1];  [1];  [5]
  1. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
  2. Univ. of Edinburgh, Scotland (United Kingdom)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Inst. Laue-Langevin (ILL), Grenoble (France)
  5. Univ. College London (UCL), London (United Kingdom)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1506794
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nature Physics
Additional Journal Information:
Journal Volume: 15; Journal Issue: 1; Journal ID: ISSN 1745-2473
Publisher:
Nature Publishing Group (NPG)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Fennell, T., Harris, M. J., Calder, S., Ruminy, M., Boehm, M., Steffens, P., Lemée-Cailleau, M. -H., Zaharko, O., Cervellino, A., and Bramwell, S. T.. Multiple Coulomb phase in the fluoride pyrochlore CsNiCrF6. United States: N. p., 2018. Web. doi:10.1038/s41567-018-0309-3.
Fennell, T., Harris, M. J., Calder, S., Ruminy, M., Boehm, M., Steffens, P., Lemée-Cailleau, M. -H., Zaharko, O., Cervellino, A., & Bramwell, S. T.. Multiple Coulomb phase in the fluoride pyrochlore CsNiCrF6. United States. doi:10.1038/s41567-018-0309-3.
Fennell, T., Harris, M. J., Calder, S., Ruminy, M., Boehm, M., Steffens, P., Lemée-Cailleau, M. -H., Zaharko, O., Cervellino, A., and Bramwell, S. T.. Mon . "Multiple Coulomb phase in the fluoride pyrochlore CsNiCrF6". United States. doi:10.1038/s41567-018-0309-3.
@article{osti_1506794,
title = {Multiple Coulomb phase in the fluoride pyrochlore CsNiCrF6},
author = {Fennell, T. and Harris, M. J. and Calder, S. and Ruminy, M. and Boehm, M. and Steffens, P. and Lemée-Cailleau, M. -H. and Zaharko, O. and Cervellino, A. and Bramwell, S. T.},
abstractNote = {The Coulomb phase is an idealized state of matter whose properties are determined by factors beyond conventional considerations of symmetry, including global topology, conservation laws and emergent order. In theory, Coulomb phases occur in ice-type systems such as water ice and spin ice; in dimer models; and in certain spin liquids. Yet, apart from ice-type systems, more general experimental examples are very scarce. Here we study the partly disordered material CsNiCrF6 and show that this material is a multiple Coulomb phase with signature correlations in three degrees of freedom: charge configurations, atom displacements and spin configurations. We use neutron and X-ray scattering to separate these correlations and to determine the magnetic excitation spectrum. Our results reveal how the structural and magnetic properties of apparently disordered materials may inherit, and be dictated by, a hidden symmetry—the local gauge symmetry of an underlying Coulomb phase.},
doi = {10.1038/s41567-018-0309-3},
journal = {Nature Physics},
issn = {1745-2473},
number = 1,
volume = 15,
place = {United States},
year = {2018},
month = {10}
}

Journal Article:
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Works referenced in this record:

A short history of SHELX
journal, December 2007

  • Sheldrick, George M.
  • Acta Crystallographica Section A Foundations of Crystallography, Vol. 64, Issue 1, p. 112-122
  • DOI: 10.1107/S0108767307043930