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Title: Phonon-mediated spin-flipping mechanism in the spin ices Dy 2 Ti 2 O 7 and Ho 2 Ti 2 O 7

To understand emergent magnetic monopole dynamics in the spin ices Ho 2Ti 2O 7 and Dy 2Ti 2O 7, it is necessary to investigate the mechanisms by which spins flip in these materials. Presently there are thought to be two processes: quantum tunneling at low and intermediate temperatures and thermally activated at high temperatures. We identify possible couplings between crystal field and optical phonon excitations and construct a strictly constrained model of phonon-mediated spin flipping that quantitatively describes the high-temperature processes in both compounds, as measured by quasielastic neutron scattering. We support the model with direct experimental evidence of the coupling between crystal field states and optical phonons in Ho 2Ti 2O 7.
Authors:
 [1] ;  [2] ;  [2] ;  [1]
  1. Paul Scherrer Inst. (PSI), Villigen (Switzerland). Lab. for Neutron Scattering and Imaging
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
Publication Date:
Grant/Contract Number:
AC05-00OR22725; 200021_140862; 200020_162626
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 95; Journal Issue: 6; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Swiss National Science Foundation (SNF)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1426592
Alternate Identifier(s):
OSTI ID: 1344588

Ruminy, M., Chi, S., Calder, S., and Fennell, Tom. Phonon-mediated spin-flipping mechanism in the spin ices Dy2Ti2O7 and Ho2Ti2O7. United States: N. p., Web. doi:10.1103/PhysRevB.95.060414.
Ruminy, M., Chi, S., Calder, S., & Fennell, Tom. Phonon-mediated spin-flipping mechanism in the spin ices Dy2Ti2O7 and Ho2Ti2O7. United States. doi:10.1103/PhysRevB.95.060414.
Ruminy, M., Chi, S., Calder, S., and Fennell, Tom. 2017. "Phonon-mediated spin-flipping mechanism in the spin ices Dy2Ti2O7 and Ho2Ti2O7". United States. doi:10.1103/PhysRevB.95.060414. https://www.osti.gov/servlets/purl/1426592.
@article{osti_1426592,
title = {Phonon-mediated spin-flipping mechanism in the spin ices Dy2Ti2O7 and Ho2Ti2O7},
author = {Ruminy, M. and Chi, S. and Calder, S. and Fennell, Tom},
abstractNote = {To understand emergent magnetic monopole dynamics in the spin ices Ho2Ti2O7 and Dy2Ti2O7, it is necessary to investigate the mechanisms by which spins flip in these materials. Presently there are thought to be two processes: quantum tunneling at low and intermediate temperatures and thermally activated at high temperatures. We identify possible couplings between crystal field and optical phonon excitations and construct a strictly constrained model of phonon-mediated spin flipping that quantitatively describes the high-temperature processes in both compounds, as measured by quasielastic neutron scattering. We support the model with direct experimental evidence of the coupling between crystal field states and optical phonons in Ho2Ti2O7.},
doi = {10.1103/PhysRevB.95.060414},
journal = {Physical Review B},
number = 6,
volume = 95,
place = {United States},
year = {2017},
month = {2}
}