Clustering induced suppression of ferromagnetism in diluted magnets

Abstract

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.

published version, 5 pages, 4 figures

References in corpus (3)

• Why RKKY exchange integrals are inappropriate to describe ferromagnetism in diluted magnetic semiconductors
• Magnetism in (III, Mn)-V Diluted Magnetic Semiconductors: Effective Heisenberg Model
• Spin waves in a band ferromagnet: spin-rotationally symmetric study with self-energy and vertex corrections

Cited by in corpus (4)

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• Fermionic representation for the ferromagnetic Kondo lattice model -- diagrammatic study of spin-charge coupling effects on magnon excitations
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• Magnon self energy in the correlated ferromagnetic Kondo lattice model: spin-charge coupling effects on magnon excitations in manganites