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A quantum liquid of magnetic octupoles on the pyrochlore lattice.
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.
Afiliación
  • Sibille R; Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland.
  • Gauthier N; Stanford Institute for Materials and Energy Science, SLAC National Accelerator Laboratory and Stanford University, Menlo Park, California 94025, USA.
  • Lhotel E; Institut Néel, CNRS-Université Joseph Fourier, 38042 Grenoble, France.
  • Porée V; Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland.
  • Pomjakushin V; Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland.
  • Ewings RA; ISIS Pulsed Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Harwell Campus, Didcot, OX11 0QX, UK.
  • Perring TG; ISIS Pulsed Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Harwell Campus, Didcot, OX11 0QX, UK.
  • Ollivier J; Institut Laue-Langevin, 71 avenue des Martyrs, 38000 Grenoble, France.
  • Wildes A; Institut Laue-Langevin, 71 avenue des Martyrs, 38000 Grenoble, France.
  • Ritter C; Institut Laue-Langevin, 71 avenue des Martyrs, 38000 Grenoble, France.
  • Hansen TC; Institut Laue-Langevin, 71 avenue des Martyrs, 38000 Grenoble, France.
  • Keen DA; ISIS Pulsed Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Harwell Campus, Didcot, OX11 0QX, UK.
  • Nilsen GJ; ISIS Pulsed Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Harwell Campus, Didcot, OX11 0QX, UK.
  • Keller L; Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland.
  • Petit S; LLB, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif-sur-Yvette, France.
  • Fennell T; Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland.
Nat Phys ; 16(5): 546-552, 2020 May.
Article en En | MEDLINE | ID: mdl-32802143
Spin liquids are highly correlated yet disordered states formed by the entanglement of magnetic dipoles1. 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 ice2-4 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' orders5-6. Here 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' rule7-8. 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.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Nat Phys Año: 2020 Tipo del documento: Article País de afiliación: Suiza Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Nat Phys Año: 2020 Tipo del documento: Article País de afiliación: Suiza Pais de publicación: Reino Unido