Dirty spin ice: The effect of dilution on spin freezing in Dy2Ti2O7
نویسندگان
چکیده
We have studied spin freezing in the diluted spin ice compound Dy22xYxTi2O7 where the nonmagnetic Y ions replace the magnetic Dy ions on the frustrated pyrochlore lattice. Magnetic ac and dc susceptibility data are presented with an analysis of relaxation times for dilutions of x50, 0.1, 0.2, and 0.4. Site dilution apparently decreases the relative number of spins participating in the icelike freezing near 16 K while leaving the freezing temperature unchanged. Correspondingly the distribution of relaxation times associated with the freezing is broadened only slightly with increasing dilution, suggesting that the freezing process observed near T516 K involves the development of local correlations among the spins.
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