Multiple Coulomb phase in the fluoride pyrochlore CsNiCrF                         6

T. Fennell; M. J. Harris; S. Calder; M. Ruminy; M. Boehm; P. Steffens; M. H. Lemée-Cailleau; O. Zaharko; A. Cervellino; S. T. Bramwell

doi:10.1038/s41567-018-0309-3

Multiple Coulomb phase in the fluoride pyrochlore CsNiCrF ₆

T. Fennell, M. J. Harris, S. Calder, M. Ruminy, M. Boehm, P. Steffens, M. H. Lemée-Cailleau, O. Zaharko, A. Cervellino, S. T. Bramwell

Powder Diffraction

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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. Theoretically, Coulomb phases occur in ice-type systems such as water ice and spin ice; in dimer models; and in certain spin liquids. However, 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 show 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.

Original language	English
Pages (from-to)	60-66
Number of pages	7
Journal	Nature Physics
Volume	15
Issue number	1
DOIs	https://doi.org/10.1038/s41567-018-0309-3
State	Published - Jan 1 2019

Funding

We thank R. Stewart, M. Green and B. Fåk for discussions, J. Chalker for reading and commenting on the manuscript, and X. Thonon for support of cryogenics at the ILL. M.R. was supported by the Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, grant no. 200021_140862. This work is based on experiments performed at the Institut Laue-Langevin, Grenoble, France; the Swiss spallation neutron source SINQ, Paul Scherrer Institut, Villigen, Switzerland; and the Swiss Light Source, Paul Scherrer Institut.

Funders	Funder number
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung	200021_140862

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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. Theoretically, Coulomb phases occur in ice-type systems such as water ice and spin ice; in dimer models; and in certain spin liquids. However, 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 show 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.",

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AU - Fennell, T.

AU - Harris, M. J.

AU - Calder, S.

AU - Ruminy, M.

AU - Boehm, M.

AU - Steffens, P.

AU - Lemée-Cailleau, M. H.

AU - Zaharko, O.

AU - Cervellino, A.

AU - Bramwell, S. T.

PY - 2019/1/1

Y1 - 2019/1/1

N2 - 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. Theoretically, Coulomb phases occur in ice-type systems such as water ice and spin ice; in dimer models; and in certain spin liquids. However, 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 show 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.

AB - 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. Theoretically, Coulomb phases occur in ice-type systems such as water ice and spin ice; in dimer models; and in certain spin liquids. However, 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 show 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.

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Multiple Coulomb phase in the fluoride pyrochlore CsNiCrF ₆

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