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Neutron scattering and mu SR investigations of the low temperature state of LuCuGaO4

Calder, S. ; Giblin, S. R. ; Parker, D. R. ; Deen, Pascale LU ; Ritter, C. ; Stewart, J. R. ; Rols, S. and Fennell, T. (2013) In Journal of Physics: Condensed Matter 25(35).
Abstract
LuCuGaO4 has magnetic Cu2+ and diamagnetic Ga3+ ions distributed on a triangular bilayer and is suggested to undergo a spin glass transition at T-g similar to 0.4 K. Using mu SR (muon spin rotation) and neutron scattering measurements, we show that at low temperature the spins form a short range correlated state with spin fluctuations detectable over a wide range of timescales: at 0.05 K magnetic fluctuations can be detected in both the mu SR time window and also extending beyond 7 meV in the inelastic neutron scattering response, indicating magnetic fluctuations spanning timescales between similar to 10(-5) and similar to 10(-10) s. The dynamical susceptibility scales according to the form chi '' (omega)T-alpha, with alpha = 1, throughout... (More)
LuCuGaO4 has magnetic Cu2+ and diamagnetic Ga3+ ions distributed on a triangular bilayer and is suggested to undergo a spin glass transition at T-g similar to 0.4 K. Using mu SR (muon spin rotation) and neutron scattering measurements, we show that at low temperature the spins form a short range correlated state with spin fluctuations detectable over a wide range of timescales: at 0.05 K magnetic fluctuations can be detected in both the mu SR time window and also extending beyond 7 meV in the inelastic neutron scattering response, indicating magnetic fluctuations spanning timescales between similar to 10(-5) and similar to 10(-10) s. The dynamical susceptibility scales according to the form chi '' (omega)T-alpha, with alpha = 1, throughout the measured temperature range (0.05-50 K). These effects are associated with quantum fluctuations and some degree of structural disorder in ostensibly quite different materials, including certain heavy fermion alloys, kagome spin liquids, quantum spin glasses, and valence bond glasses. We therefore suggest that LuCuGaO4 is an interesting model compound for the further examination of disorder and quantum magnetism. (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physics: Condensed Matter
volume
25
issue
35
article number
356002
publisher
IOP Publishing
external identifiers
  • wos:000323004100018
  • scopus:84881505765
  • pmid:23917326
ISSN
1361-648X
DOI
10.1088/0953-8984/25/35/356002
language
English
LU publication?
yes
id
49da89b2-f047-44eb-8786-015713bd4181 (old id 4061449)
date added to LUP
2016-04-01 12:58:01
date last changed
2020-11-22 06:34:17
@article{49da89b2-f047-44eb-8786-015713bd4181,
  abstract     = {LuCuGaO4 has magnetic Cu2+ and diamagnetic Ga3+ ions distributed on a triangular bilayer and is suggested to undergo a spin glass transition at T-g similar to 0.4 K. Using mu SR (muon spin rotation) and neutron scattering measurements, we show that at low temperature the spins form a short range correlated state with spin fluctuations detectable over a wide range of timescales: at 0.05 K magnetic fluctuations can be detected in both the mu SR time window and also extending beyond 7 meV in the inelastic neutron scattering response, indicating magnetic fluctuations spanning timescales between similar to 10(-5) and similar to 10(-10) s. The dynamical susceptibility scales according to the form chi '' (omega)T-alpha, with alpha = 1, throughout the measured temperature range (0.05-50 K). These effects are associated with quantum fluctuations and some degree of structural disorder in ostensibly quite different materials, including certain heavy fermion alloys, kagome spin liquids, quantum spin glasses, and valence bond glasses. We therefore suggest that LuCuGaO4 is an interesting model compound for the further examination of disorder and quantum magnetism.},
  author       = {Calder, S. and Giblin, S. R. and Parker, D. R. and Deen, Pascale and Ritter, C. and Stewart, J. R. and Rols, S. and Fennell, T.},
  issn         = {1361-648X},
  language     = {eng},
  number       = {35},
  publisher    = {IOP Publishing},
  series       = {Journal of Physics: Condensed Matter},
  title        = {Neutron scattering and mu SR investigations of the low temperature state of LuCuGaO4},
  url          = {http://dx.doi.org/10.1088/0953-8984/25/35/356002},
  doi          = {10.1088/0953-8984/25/35/356002},
  volume       = {25},
  year         = {2013},
}