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Title: Behavior of the breathing pyrochlore lattice Ba 3Yb 2Zn 5O 11 in applied magnetic field

Abstract

The breathing pyrochlore lattice material Ba 3Yb 2Zn 5O 11 exists in the nearly decoupled limit, in contrast to most other well-studied breathing pyrochlore compounds. As a result, it constitutes a useful platform to benchmark theoretical calculations of exchange interactions in insulating Yb 3+ magnets. Here we study Ba 3Yb 2Zn 5O 11 at low temperatures in applied magnetic fields as a further probe of the physics of this model system. Experimentally, we consider the behavior of polycrystalline samples of Ba 3Yb 2Zn 5O 11 with a combination of inelastic neutron scattering and heat capacity measurements down to 75 mK and up to fields of 10 T. Consistent with previous work, inelastic neutron scattering finds a level crossing near 3 T, but no significant dispersion of the spin excitations is detected up to the highest applied fields. Refinement of the theoretical model previously determined at zero field can reproduce much of the inelastic neutron scattering spectra and specific heat data. A notable exception is a low temperature peak in the specific heat at ~0.1 K. This may indicate the scale of interactions between tetrahedra or may reflect undetected disorder in Ba 3Yb 2Zn 5O 11.

Authors:
 [1];  [2];  [3];  [2];  [4]; ORCiD logo [5];  [6]; ORCiD logo [7]; ORCiD logo [8];  [2];  [9]; ORCiD logo [10]
  1. Univ. of Waterloo, ON (Canada). Dept. of Physics and Astronomy; Max Planck Inst. for the Physics of Complex Systems, Dresden (Germany)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
  4. Univ. of Maryland, College Park, MD (United States). Dept. of Physics. Dept. of Materials Science and Engineering. Center for Nanophysics and Advanced Materials; National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). NIST Center for Neutron Research
  5. Univ. of Maryland, College Park, MD (United States). Dept. of Physics. Center for Nanophysics and Advanced Materials
  6. Univ. of Maryland, College Park, MD (United States). Dept. of Physics. Center for Nanophysics and Advanced Materials; National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). NIST Center for Neutron Research
  7. Colorado State Univ., Fort Collins, CO (United States). Dept. of Physics; Canadian Inst. for Advanced Research, Toronto, ON (Canada)
  8. Colorado State Univ., Fort Collins, CO (United States). Dept. of Physics
  9. Univ. of Waterloo, ON (Canada). Dept. of Physics and Astronomy; Perimeter Inst. for Theoretical Physics, Waterloo, ON (Canada); Canadian Inst. for Advanced Research, Toronto, ON (Canada)
  10. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division. Materials Science & Technology Division
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Waterloo, ON (Canada); Canadian Inst. for Advanced Research, Toronto, ON (Canada); Perimeter Inst. for Theoretical Physics, Waterloo, ON (Canada)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); ORNL Laboratory Directed Research and Development (LDRD) Program; Natural Sciences and Engineering Research Council of Canada (NSERC); Innovation, Science and Economic Development Canada; Ministry of Economic Development, Job Creation and Trade of Ontario (Canada)
OSTI Identifier:
1479745
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Physics. Condensed Matter
Additional Journal Information:
Journal Volume: 30; Journal Issue: 45; Journal ID: ISSN 0953-8984
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; pyrochlore; inelastic neutron scattering; breathing pyrochlore; anisotropic exchange

Citation Formats

Rau, J. G., Wu, L. S., May, A. F., Taylor, A. E., Liu, I-Lin, Higgins, J., Butch, N. P., Ross, K. A., Nair, H. S., Lumsden, M. D., Gingras, M. J. P., and Christianson, A. D. Behavior of the breathing pyrochlore lattice Ba3Yb2Zn5O11 in applied magnetic field. United States: N. p., 2018. Web. doi:10.1088/1361-648X/aae45a.
Rau, J. G., Wu, L. S., May, A. F., Taylor, A. E., Liu, I-Lin, Higgins, J., Butch, N. P., Ross, K. A., Nair, H. S., Lumsden, M. D., Gingras, M. J. P., & Christianson, A. D. Behavior of the breathing pyrochlore lattice Ba3Yb2Zn5O11 in applied magnetic field. United States. doi:10.1088/1361-648X/aae45a.
Rau, J. G., Wu, L. S., May, A. F., Taylor, A. E., Liu, I-Lin, Higgins, J., Butch, N. P., Ross, K. A., Nair, H. S., Lumsden, M. D., Gingras, M. J. P., and Christianson, A. D. Wed . "Behavior of the breathing pyrochlore lattice Ba3Yb2Zn5O11 in applied magnetic field". United States. doi:10.1088/1361-648X/aae45a. https://www.osti.gov/servlets/purl/1479745.
@article{osti_1479745,
title = {Behavior of the breathing pyrochlore lattice Ba3Yb2Zn5O11 in applied magnetic field},
author = {Rau, J. G. and Wu, L. S. and May, A. F. and Taylor, A. E. and Liu, I-Lin and Higgins, J. and Butch, N. P. and Ross, K. A. and Nair, H. S. and Lumsden, M. D. and Gingras, M. J. P. and Christianson, A. D.},
abstractNote = {The breathing pyrochlore lattice material Ba3Yb2Zn5O11 exists in the nearly decoupled limit, in contrast to most other well-studied breathing pyrochlore compounds. As a result, it constitutes a useful platform to benchmark theoretical calculations of exchange interactions in insulating Yb3+ magnets. Here we study Ba3Yb2Zn5O11 at low temperatures in applied magnetic fields as a further probe of the physics of this model system. Experimentally, we consider the behavior of polycrystalline samples of Ba3Yb2Zn5O11 with a combination of inelastic neutron scattering and heat capacity measurements down to 75 mK and up to fields of 10 T. Consistent with previous work, inelastic neutron scattering finds a level crossing near 3 T, but no significant dispersion of the spin excitations is detected up to the highest applied fields. Refinement of the theoretical model previously determined at zero field can reproduce much of the inelastic neutron scattering spectra and specific heat data. A notable exception is a low temperature peak in the specific heat at ~0.1 K. This may indicate the scale of interactions between tetrahedra or may reflect undetected disorder in Ba3Yb2Zn5O11.},
doi = {10.1088/1361-648X/aae45a},
journal = {Journal of Physics. Condensed Matter},
number = 45,
volume = 30,
place = {United States},
year = {2018},
month = {9}
}

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