ac Wien Effect in Spin Ice, Manifest in Nonlinear, Nonequilibrium Susceptibility

The Wien effect is a model process for field-induced charge creation. Here it is derived for a nonelectrical system: the spin ice "magnetolyte"-a unique system showing perfect charge symmetry. An entropic reaction field, analogous to the Jaccard field in ice, opposes direct current, but a...

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Bibliographic Details
Published in:Physical review letters 2015-07, Vol.115 (3), p.037201-037201, Article 037201
Main Authors: Kaiser, V, Bramwell, S T, Holdsworth, P C W, Moessner, R
Format: Article
Language:English
Subjects:
Alternating current
Charge
Density
Dynamical systems
Electrolytes
Nonlinear dynamics
Nonlinearity
Spin ice
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Summary:The Wien effect is a model process for field-induced charge creation. Here it is derived for a nonelectrical system: the spin ice "magnetolyte"-a unique system showing perfect charge symmetry. An entropic reaction field, analogous to the Jaccard field in ice, opposes direct current, but a frequency window exists in which the Wien effect for magnetolyte and electrolyte are indistinguishable. The universal enhancement of monopole density speeds up the magnetization dynamics, which manifests in the nonlinear, nonequilibrium ac susceptibility. This is a rare instance where such effects may be calculated, providing new insights for electrolytes. Experimental predictions are made for Dy2Ti2O7 spin ice.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.115.037201