Clustering induced suppression of ferromagnetism in diluted magnets

Details Clustering induced suppression of ferromagnetism in diluted magnets Clustering induced suppression of ferromagnetism in diluted magnets

2006-08-22

arxiv.org/abs/cond-mat/0608474v2

Phys. Rev. B 75, 035206 (2007)

Physics

Condensed Matter

Materials Science

published version, 5 pages, 4 figures

Scientific paper

Ferromagnetism in diluted magnets in the compensated regime p << x is shown to be suppressed by the formation of impurity spin clusters. The majority bulk spin couplings are shown to be considerably weakened by the preferential accumulation of holes in spin clusters, resulting in low-energy magnon softening and enhanced low-temperature decay of magnetic order. A locally self-consistent magnon renormalization analysis of spin dynamics shows that although strong intra-cluster correlations tend to prolong global order, T_c is still reduced compared to the ordered case.

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