Supercooling and fragile glassiness in a dipolar kagome Ising magnet
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Authors
Hamp, J
Moessner, R
Castelnovo, C
Publication Date
2018Journal Title
Physical Review B
ISSN
2469-9950
Publisher
American Physical Society (APS)
Volume
98
Issue
14
Type
Article
This Version
AM
Metadata
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Hamp, J., Moessner, R., & Castelnovo, C. (2018). Supercooling and fragile glassiness in a dipolar kagome Ising magnet. Physical Review B, 98 (14) https://doi.org/10.1103/PhysRevB.98.144439
Abstract
We study equilibration and ordering in the classical dipolar kagome Ising
antiferromagnet, which we show behaves as a disorder-free fragile spin glass.
By identifying an appropriate order parameter, we demonstrate a transition to
the ordered state proposed by Chioar et al. [Phys. Rev. B 93, 214410 (2016)]
with a 12-site unit cell that breaks time-reversal and sublattice symmetries,
and further provide evidence that the nature of the transition is first order.
Upon approaching the transition, the spin dynamics slow dramatically. The
system readily falls out of equilibrium, overshooting the transition and
entering a supercooled liquid regime. Using extensive Monte Carlo simulations,
we show that the system exhibits super-Arrhenius behaviour above the ordering
transition. The relaxation time diverges according to a Vogel-Fulcher form at a
finite `glass transition' temperature in the supercooled regime. Such
behaviour, characteristic of fragile glasses, is particularly remarkable as the
model is free of quenched disorder, does not straightforwardly conform to the
avoided criticality paradigm, and is simple and eminently realisable in
engineered nanomagnetic arrays.
Sponsorship
Engineering and Physical Sciences Research Council (EP/K028960/1)
Engineering and Physical Sciences Research Council (EP/P034616/1)
Engineering and Physical Sciences Research Council (EP/M007065/1)
Identifiers
External DOI: https://doi.org/10.1103/PhysRevB.98.144439
This record's URL: https://www.repository.cam.ac.uk/handle/1810/286551
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