Anisotropic Exchange within Decoupled Tetrahedra in the Quantum Breathing Pyrochlore
Abstract
The low energy spin excitation spectrum of the breathing pyrochlore 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.
- Authors:
-
- Univ. of Waterloo, ON (Canada)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division; Univ. of Tennessee, Knoxville, TN (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical and Engineering Materials Division
- Univ. of Waterloo, ON (Canada); Perimeter Inst. for Theoretical Physics, Waterloo, ON (Canada)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1260086
- Alternate Identifier(s):
- OSTI ID: 1259338
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Physical Review Letters
- Additional Journal Information:
- Journal Volume: 116; Journal Issue: 25; Journal ID: ISSN 0031-9007
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Citation Formats
Rau, J. G., Wu, L. S., May, A. F., Poudel, L., Winn, B., Garlea, V. O., Huq, A., Whitfield, P., Taylor, A. E., Lumsden, M. D., Gingras, M. J. P., and Christianson, A. D. Anisotropic Exchange within Decoupled Tetrahedra in the Quantum Breathing Pyrochlore Ba3Yb2Zn5O11. United States: N. p., 2016.
Web. doi:10.1103/PhysRevLett.116.257204.
Rau, J. G., Wu, L. S., May, A. F., Poudel, L., Winn, B., Garlea, V. O., Huq, A., Whitfield, P., Taylor, A. E., Lumsden, M. D., Gingras, M. J. P., & Christianson, A. D. Anisotropic Exchange within Decoupled Tetrahedra in the Quantum Breathing Pyrochlore Ba3Yb2Zn5O11. United States. https://doi.org/10.1103/PhysRevLett.116.257204
Rau, J. G., Wu, L. S., May, A. F., Poudel, L., Winn, B., Garlea, V. O., Huq, A., Whitfield, P., Taylor, A. E., Lumsden, M. D., Gingras, M. J. P., and Christianson, A. D. 2016.
"Anisotropic Exchange within Decoupled Tetrahedra in the Quantum Breathing Pyrochlore Ba3Yb2Zn5O11". United States. https://doi.org/10.1103/PhysRevLett.116.257204. https://www.osti.gov/servlets/purl/1260086.
@article{osti_1260086,
title = {Anisotropic Exchange within Decoupled Tetrahedra in the Quantum Breathing Pyrochlore Ba3Yb2Zn5O11},
author = {Rau, J. G. and Wu, L. S. and May, A. F. and Poudel, L. and Winn, B. and Garlea, V. O. and Huq, A. and Whitfield, P. and Taylor, A. E. and Lumsden, M. D. and Gingras, M. J. P. and Christianson, A. D.},
abstractNote = {The low energy spin excitation spectrum of the breathing pyrochlore Ba3Yb2Zn5O11 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.},
doi = {10.1103/PhysRevLett.116.257204},
url = {https://www.osti.gov/biblio/1260086},
journal = {Physical Review Letters},
issn = {0031-9007},
number = 25,
volume = 116,
place = {United States},
year = {Fri Jun 24 00:00:00 EDT 2016},
month = {Fri Jun 24 00:00:00 EDT 2016}
}
Web of Science
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