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Title: A quantum liquid of magnetic octupoles on the pyrochlore lattice

Abstract

Spin liquids are highly correlated yet disordered states formed by the entanglement of magnetic dipoles. Theories define such states using gauge fields and deconfined quasiparticle excitations that emerge from a local constraint governing the ground state of a frustrated magnet. For example, the ‘2-in–2-out’ ice rule for dipole moments on a tetrahedron can lead to a quantum spin ice in rare-earth pyrochlores. However, $f$-electron ions often carry multipole degrees of freedom of higher rank than dipoles, leading to intriguing behaviours and ‘hidden’ orders. In this paper we show that the correlated ground state of a Ce3+-based pyrochlore, Ce2Sn2O7, is a quantum liquid of magnetic octupoles. Our neutron scattering results are consistent with a fluid-like state where degrees of freedom have a more complex magnetization density than that of magnetic dipoles. The nature and strength of the octupole–octupole couplings, together with the existence of a continuum of excitations attributed to spinons, provides further evidence for a quantum ice of octupoles governed by a ‘2-plus–2-minus’ rule. Our work identifies Ce2Sn2O7 as a unique example of frustrated multipoles forming a ‘hidden’ topological order, thus generalizing observations on quantum spin liquids to multipolar phases that can support novel types of emergent fields and excitations.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3];  [1];  [1];  [4]; ORCiD logo [4]; ORCiD logo [5];  [5];  [5]; ORCiD logo [5]; ORCiD logo [4];  [4];  [1]; ORCiD logo [6]; ORCiD logo [1]
  1. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
  3. Univ. Grenoble Alpes, Grenoble (France)
  4. Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Lab. (RAL)
  5. Inst. Laue-Langevin (ILL), Grenoble (France)
  6. Univ. Paris-Saclay, Gif-sur-Yvette (France)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE; Science and Technology Facilities Council (STFC); Swiss National Science Foundation (SNF)
OSTI Identifier:
1616962
Grant/Contract Number:  
AC02-76SF00515; 200021_179150
Resource Type:
Accepted Manuscript
Journal Name:
Nature Physics
Additional Journal Information:
Journal Volume: 16; Journal Issue: 5; Journal ID: ISSN 1745-2473
Publisher:
Nature Publishing Group (NPG)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Magnetic properties and materials; Quantum fluids and solids

Citation Formats

Sibille, Romain, Gauthier, Nicolas, Lhotel, Elsa, Porée, Victor, Pomjakushin, Vladimir, Ewings, Russell A., Perring, Toby G., Ollivier, Jacques, Wildes, Andrew, Ritter, Clemens, Hansen, Thomas C., Keen, David A., Nilsen, Gøran J., Keller, Lukas, Petit, Sylvain, and Fennell, Tom. A quantum liquid of magnetic octupoles on the pyrochlore lattice. United States: N. p., 2020. Web. doi:10.1038/s41567-020-0827-7.
Sibille, Romain, Gauthier, Nicolas, Lhotel, Elsa, Porée, Victor, Pomjakushin, Vladimir, Ewings, Russell A., Perring, Toby G., Ollivier, Jacques, Wildes, Andrew, Ritter, Clemens, Hansen, Thomas C., Keen, David A., Nilsen, Gøran J., Keller, Lukas, Petit, Sylvain, & Fennell, Tom. A quantum liquid of magnetic octupoles on the pyrochlore lattice. United States. doi:https://doi.org/10.1038/s41567-020-0827-7
Sibille, Romain, Gauthier, Nicolas, Lhotel, Elsa, Porée, Victor, Pomjakushin, Vladimir, Ewings, Russell A., Perring, Toby G., Ollivier, Jacques, Wildes, Andrew, Ritter, Clemens, Hansen, Thomas C., Keen, David A., Nilsen, Gøran J., Keller, Lukas, Petit, Sylvain, and Fennell, Tom. Mon . "A quantum liquid of magnetic octupoles on the pyrochlore lattice". United States. doi:https://doi.org/10.1038/s41567-020-0827-7. https://www.osti.gov/servlets/purl/1616962.
@article{osti_1616962,
title = {A quantum liquid of magnetic octupoles on the pyrochlore lattice},
author = {Sibille, Romain and Gauthier, Nicolas and Lhotel, Elsa and Porée, Victor and Pomjakushin, Vladimir and Ewings, Russell A. and Perring, Toby G. and Ollivier, Jacques and Wildes, Andrew and Ritter, Clemens and Hansen, Thomas C. and Keen, David A. and Nilsen, Gøran J. and Keller, Lukas and Petit, Sylvain and Fennell, Tom},
abstractNote = {Spin liquids are highly correlated yet disordered states formed by the entanglement of magnetic dipoles. Theories define such states using gauge fields and deconfined quasiparticle excitations that emerge from a local constraint governing the ground state of a frustrated magnet. For example, the ‘2-in–2-out’ ice rule for dipole moments on a tetrahedron can lead to a quantum spin ice in rare-earth pyrochlores. However, $f$-electron ions often carry multipole degrees of freedom of higher rank than dipoles, leading to intriguing behaviours and ‘hidden’ orders. In this paper we show that the correlated ground state of a Ce3+-based pyrochlore, Ce2Sn2O7, is a quantum liquid of magnetic octupoles. Our neutron scattering results are consistent with a fluid-like state where degrees of freedom have a more complex magnetization density than that of magnetic dipoles. The nature and strength of the octupole–octupole couplings, together with the existence of a continuum of excitations attributed to spinons, provides further evidence for a quantum ice of octupoles governed by a ‘2-plus–2-minus’ rule. Our work identifies Ce2Sn2O7 as a unique example of frustrated multipoles forming a ‘hidden’ topological order, thus generalizing observations on quantum spin liquids to multipolar phases that can support novel types of emergent fields and excitations.},
doi = {10.1038/s41567-020-0827-7},
journal = {Nature Physics},
number = 5,
volume = 16,
place = {United States},
year = {2020},
month = {3}
}

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