Evan Smith
(Department of Physics and Astronomy, McMaster University)
The Ce3+ pseudospin-½ degrees of freedom in the pyrochlore magnet Ce2Zr2O7 are known to possess dipole-octupole character, making it a candidate for novel quantum spin liquid ground states at low temperatures. We’ve measured the heat capacity of Ce2Zr2O7 and fit the result to a quantum numerical linked cluster (NLC) calculation that allows estimates for the terms in the near-neighbour XYZ Hamiltonian expected for such dipole-octupole pyrochlore systems. Fits of the same theory to the temperature dependence of the magnetic susceptibility and unpolarized neutron scattering complement this analysis to produce robust estimates of the near-neighbour exchange parameters. A comparison between the resulting best fit NLC calculation and new polarized neutron diffraction results shows agreement, as well as discrepancies which are attributed to interactions beyond near-neighbours, such as zone-boundary diffuse scattering in the non-spin flip channel. We conclude that Ce2Zr2O7 realizes a U(1)π quantum spin liquid state at low temperatures, and one that resides near the boundary between dipolar and octupolar character.
Evan Smith
(Department of Physics and Astronomy, McMaster University)
Owen Benton
(Max Planck Institute for the Physics of Complex Systems)
Danielle Yahne
(Department of Physics, Colorado State University)
Benedikt Placke
(Max Planck Institute for the Physics of Complex Systems)
Schäfer Robin
(Max Planck Institute for the Physics of Complex Systems)
Jonathan Gaudet
(Department of Physics and Astronomy, McMaster University)
Jeremi Dudemaine
(Département de Physique, Université de Montréal and Regroupement Québécois sur les Matériaux de Pointe (RQMP))
Avner Fitterman
(Département de Physique, Université de Montréal and Regroupement Québécois sur les Matériaux de Pointe (RQMP))
James Beare
(Department of Physics and Astronomy, McMaster University)
Andrew Wildes
(Institut Laue-Langevin)
Suvam Bhattacharya
(Université Paris-Saclay, CNRS, Laboratoiré de Physique des Solides)
Tim DeLazzer
(Department of Physics, Colorado State University)
Connor Buhariwalla
(Department of Physics and Astronomy, McMaster University)
Nicholas Butch
(Center for Neutron Research, National Institute of Standards and Technology)
Roman Movshovich
(Los Alamos National Lab)
Jim Garrett
(Brockhouse Institute for Materials Research, McMaster University)
Casey Marjerrison
(Brockhouse Institute for Materials Research, McMaster University)
Pat Clancy
(Brockhouse Institute for Materials Research, McMaster University and Department of Physics and Astronomy, McMaster University)
Edwin Kermarrec
(Université Paris-Saclay, CNRS, Laboratoiré de Physique des Solides)
Graeme Luke
(Brockhouse Institute for Materials Research, McMaster University and Department of Physics and Astronomy, McMaster University)
Andrea Bianchi
(Département de Physique, Université de Montréal and Regroupement Québécois sur les Matériaux de Pointe (RQMP))
Kate Ross
(Department of Physics, Colorado State University and Canadian Institute for Advanced Research)
Bruce Gaulin
(Brockhouse Institute for Materials Research, McMaster University and Department of Physics and Astronomy, McMaster University and Canadian Institute for Advanced Research)
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