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Title: Anisotropic Exchange within Decoupled Tetrahedra in the Quantum Breathing Pyrochlore Ba 3 Yb 2 Zn 5 O 11

Journal Article · · Physical Review Letters
 [1];  [2];  [3];  [4];  [2];  [2];  [5];  [5];  [2];  [2];  [6];  [4]
  1. Univ. of Waterloo, ON (Canada)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division; Univ. of Tennessee, Knoxville, TN (United States)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical and Engineering Materials Division
  6. Univ. of Waterloo, ON (Canada); Perimeter Inst. for Theoretical Physics, Waterloo, ON (Canada)

The low energy spin excitation spectrum of the breathing pyrochlore Ba 3 Yb 2 Zn 5 O 11 has been investigated with inelastic neutron scattering. Several nearly resolution limited modes with no observable dispersion are observed at 250 mK while, at elevated temperatures, transitions between excited levels become visible. To gain deeper insight, a theoretical model of isolated Yb3+ tetrahedra parametrized by four anisotropic exchange constants is constructed. The model reproduces the inelastic neutron scattering data, specific heat, and magnetic susceptibility with high fidelity. The fitted exchange parameters reveal a Heisenberg antiferromagnet with a very large Dzyaloshinskii-Moriya interaction. Ultimately, using this model, we predict the appearance of an unusual octupolar paramagnet at low temperatures and speculate on the development of inter-tetrahedron correlations.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1260086
Alternate ID(s):
OSTI ID: 1259338
Journal Information:
Physical Review Letters, Vol. 116, Issue 25; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 50 works
Citation information provided by
Web of Science

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Cited By (14)

Electric field control of emergent electrodynamics in quantum spin ice journal September 2017
Spin–orbit coupled molecular quantum magnetism realized in inorganic solid journal September 2016
Formation of breathing pyrochlore lattices: structural, thermodynamic and crystal chemical aspects journal January 2020
Electric field response in breathing pyrochlores journal August 2019
Flat bands and Dirac cones in breathing lattices journal June 2017
Weyl magnons in pyrochlore antiferromagnets with an all-in-all-out order journal March 2018
Spin ordering induced by lattice distortions in classical Heisenberg antiferromagnets on the breathing pyrochlore lattice journal April 2019
Weyl magnons in breathing pyrochlore antiferromagnets journal September 2016
Magnonic analog of the Edelstein effect in antiferromagnetic insulators journal January 2020
Quantum spin ice on the breathing pyrochlore lattice text January 2015
Flat bands and Dirac cones in breathing lattices text January 2016
Behavior of the breathing pyrochlore lattice Ba$_3$Yb$_2$Zn$_5$O$_{11}$ in applied magnetic field text January 2018
Electric Field Response In Breathing Pyrochlores text January 2019
Magnonic Analogue of Edelstein Effect in Antiferromagnetic Insulators text January 2019

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