Magnetic Percolation in Diluted Magnetic Semiconductors

L. Bergqvist, O. Eriksson, J. Kudrnovský, V. Drchal, P. Korzhavyi, and I. Turek
Phys. Rev. Lett. 93, 137202 – Published 24 September 2004

Abstract

We demonstrate that the magnetic properties of diluted magnetic semiconductors are dominated by short ranged interatomic exchange interactions that have a strong directional dependence. By combining first principles calculations of interatomic exchange interactions with a classical Heisenberg model and Monte Carlo simulations, we reproduce the observed critical temperatures of a broad range of diluted magnetic semiconductors. We also show that agreement between theory and experiment is obtained only when the magnetic atoms are randomly positioned. This suggests that the ordering of diluted magnetic semiconductors is heavily influenced by magnetic percolation, and that the measured critical temperatures should be very sensitive to details in the sample preparation, in agreement with observations.

  • Figure
  • Received 13 February 2004

DOI:https://doi.org/10.1103/PhysRevLett.93.137202

©2004 American Physical Society

Authors & Affiliations

L. Bergqvist1, O. Eriksson1, J. Kudrnovský2, V. Drchal2, P. Korzhavyi3, and I. Turek4

  • 1Department of Physics, Uppsala University, Box 530, 751 21 Uppsala, Sweden
  • 2Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, CZ-182 21 Prague 8, Czech Republic
  • 3Department of Materials Science, Royal Institute of Technology, SE-10044,Stockholm, Sweden
  • 4Institute of Physics of Materials, Academy of Sciences of the Czech Republic, Zizkova 22, CZ-616 62 Brno, Czech Republic

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Issue

Vol. 93, Iss. 13 — 24 September 2004

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