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Magnetic percolation in diluted magnetic semiconductors
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.ORCID iD: 0000-0003-4341-5663
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2004 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 93, no 13, 137202- p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2004. Vol. 93, no 13, 137202- p.
National Category
Materials Engineering Condensed Matter Physics
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URN: urn:nbn:se:kth:diva-40561DOI: 10.1103/PhysRevLett.93.137202ISI: 000224131400072Scopus ID: 2-s2.0-19644398048OAI: oai:DiVA.org:kth-40561DiVA: diva2:441565
Note

QC 20110916

Available from: 2011-09-16 Created: 2011-09-16 Last updated: 2017-12-08Bibliographically approved

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Publisher's full textScopushttp://link.aps.org/doi/10.1103/PhysRevLett.93.137202

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Bergqvist, LarsKorzhavyi, Pavel

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