Field-Driven Transitions in the Dipolar Pyrochlore Antiferromagnet Gd2Ti2O7
Olivier Cepas, B. Sriram Shastry
Abstract
We present a mean-field theory for magnetic field driven transitions in dipolar coupled gadolinium titanate Gd2Ti2O7 pyrochlore system. Low temperature neutron scattering yields a phase that can be regarded as a 8 sublattice antiferromagnet, in which long-ranged ordered moments and fluctuating moments coexist. Our theory gives parameter regions where such a phase is realized, and predicts several other phases, with transitions amongst them driven by magnetic field as well as temperature. We find several instances of local disorder parameters describing the transitions.
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