title: Ground state selection under pressure in the quantum pyrochlore magnet Yb2Ti2O7.
abstract: A quantum spin liquid is a state of matter characterized by quantum entanglement and the absence of any broken symmetry. In condensed matter, the frustrated rare-earth pyrochlore magnets Ho2Ti2O7and Dy2Ti2O7, so-called spin ices, exhibit a classical spin liquid state with fractionalized thermal excitations (magnetic monopoles). Evidence for a quantum spin ice, in which the magnetic monopoles become long range entangled and an emergent quantum electrodynamics arises, seems within reach. The magnetic properties of the quantum spin ice candidate Yb2Ti2O7have eluded a global understanding and even the presence or absence of static magnetic order at low temperatures is controversial. Here we show that sensitivity to pressure is the missing key to the low temperature behaviour of Yb2Ti2O7. By combining neutron diffraction and muon spin relaxation on a stoichiometric sample under pressure, we evidence a magnetic transition from a disordered, non-magnetic, ground state to a splayed ferromagnetic ground state.
authors.affiliation: Laboratoire de Physique des Solides, CNRS, Univ. Paris-Sud, Université Paris-Saclay, Orsay Cedex 91405, France.|Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4M1.|Laboratoire National des Champs Magnétiques Intenses, CNRS, Grenoble BP 166-38042, France.
authors.forename: E
authors.identifier: 0000-0002-3467-5482
authors.initials: E
authors.lastname: Kermarrec
authors.affiliation: Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4M1.
authors.forename: J
authors.initials: J
authors.lastname: Gaudet
authors.affiliation: Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz 1, Berlin 14109, Germany.
authors.forename: K
authors.initials: K
authors.lastname: Fritsch
authors.affiliation: Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, Villigen PSI CH-5232, Switzerland.
authors.forename: R
authors.initials: R
authors.lastname: Khasanov
authors.affiliation: Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, Villigen PSI CH-5232, Switzerland.
authors.forename: Z
authors.initials: Z
authors.lastname: Guguchia
authors.affiliation: Institut Laue Langevin, BP 156, Grenoble 38042, France.
authors.forename: C
authors.initials: C
authors.lastname: Ritter
authors.affiliation: Department of Physics, Colorado State University, Fort Collins, Colorado 80523-1875, USA.
authors.forename: K A
authors.initials: KA
authors.lastname: Ross
authors.affiliation: Brockhouse Institute for Materials Research, McMaster University, Hamilton, Ontario, Canada L8S 4M1.
authors.forename: H A
authors.initials: HA
authors.lastname: Dabkowska
authors.affiliation: Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4M1.|Brockhouse Institute for Materials Research, McMaster University, Hamilton, Ontario, Canada L8S 4M1.|Canadian Institute for Advanced Research, 180 Dundas St. W., Toronto, Ontario, Canada M5G 1Z8.
authors.forename: B D
authors.initials: BD
authors.lastname: Gaulin