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Limits on the Curie temperature of (III,Mn)V ferromagnetic semiconductors

John Schliemann·Jürgen König·Hsiu-Hau Lin·Allan H. MacDonald
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Abstract

Mean-field-theory predicts that the Curie temperature T_c of a (III,Mn)V ferromagnet will be proportional to the valence band density-of-states of its host (III,V) semiconductor, suggesting a route toward room-temperature ferromagnetism in this materials class. In this Letter, we use theoretical estimates of spin-wave energies and Monte-Carlo simulations to demonstrate that long-wavelength collective fluctuations, neglected by mean-field theory, will limit the critical temperature in large density-of-states materials. We discuss implications for high T_c searches.

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John Schliemann, Jürgen König, Hsiu-Hau Lin, Allan H. MacDonald. 2001-01-19. Limits on the Curie temperature of (III,Mn)V ferromagnetic semiconductors. https://doi.org/10.1063/1.1355300

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