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Title: Multiple Coulomb phase in the fluoride pyrochlore CsNiCrF6

Journal Article · · Nature Physics
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)

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.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1506794
Journal Information:
Nature Physics, Journal Name: Nature Physics Journal Issue: 1 Vol. 15; ISSN 1745-2473
Publisher:
Nature Publishing Group (NPG)Copyright Statement
Country of Publication:
United States
Language:
English

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