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 {\em local} disorder parameters describing the transitions.
@article{arxiv.cond-mat/0306638,
title = {Field-Driven Transitions in the Dipolar Pyrochlore Antiferromagnet Gd$_2$Ti$_2$O$_7$},
author = {Olivier Cepas and B. Sriram Shastry},
journal= {arXiv preprint arXiv:cond-mat/0306638},
year = {2009}
}
Comments
4 pages, 5 figures. v2: longer version with 2 add.fig., to appear in PRB