Journal
PHYSICAL REVIEW LETTERS
Volume 84, Issue 15, Pages 3430-3433Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.3430
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Recent experiments suggest that the Ising pyrochlore magnets Ho2Ti2O7 and Dy2Ti2O7 display qualitative properties of the nearest-neighbor spin ice model. We discuss the dipolar energy scale present in both these materials and discuss how spin-ice behavior can occur despite the presence of long-range dipolar interactions. We present results of numerical simulations and a mean field analysis of Ising pyrochlore systems. Eased on our quantitative theory, we suggest that the spin-ice behavior in these systems is due to long-range dipolar interactions, and chat the nearest-neighbor exchange in Dy2Ti2O7 is antiferromagnetic.
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