Theory of Two-Step Magnetic Ordering Phenomena in a Geometrically Frustrated Heisenberg Pyrochlore Antiferromagnet with Long Range Dipolar Interactions

2003/07/07 by Matthew Enjalran, Michel J. P. Gingras, Enjalran, Matthew +1
Physics and Astronomy · #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Statistical Mechanics (cond-mat.stat-mech) #cond-mat.mtrl-sci #cond-mat.stat-mech

paper · pdf · doi:10.48550/arxiv.cond-mat/0307152

Revtex4, 5 pages, 5 eps figures

arxiv created 2003/07/07 · arxiv updated 2009/12/01

Abstract

A model for a Heisenberg antiferromagnet on a pyrochlore lattice with exchange and dipole-dipole interactions is studied via mean-field theory. In treating the dipoles by use of the Ewald method, a soft (critical) mode with a unique ordering wave vector is selected for all strengths of the dipole-dipole coupling. For weak dipoles a partially ordered, three sublattice spin structure (P state), with q_ord= (1/2 1/2 1/2), is selected. A fully ordered, four sublattice spin structure (F state), with q = (000), competes with the P state and becomes the stable structure as the temperature is reduced. Our results are compared against other theoretical calculations and connections to recent experimental results for Gd2Ti2O7 are discussed.

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