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Interpretation of the spin glass behaviour of diluted magnetic semiconductors below the nearest-neighbour percolation threshold via realistic Monte Carlo simulations

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dc.contributor.author Karaoulanis, D en
dc.contributor.author Xanthakis, JP en
dc.contributor.author Bacalis, NC en
dc.date.accessioned 2014-03-01T01:15:40Z
dc.date.available 2014-03-01T01:15:40Z
dc.date.issued 2000 en
dc.identifier.issn 0304-8853 en
dc.identifier.uri http://hdl.handle.net/123456789/13656
dc.subject nearest-neighbour percolation threshold en
dc.subject classical Heisenberg Hamiltonian en
dc.subject Monte Carlo simulations en
dc.subject.classification Materials Science, Multidisciplinary en
dc.subject.classification Physics, Condensed Matter en
dc.subject.other PHASE en
dc.title Interpretation of the spin glass behaviour of diluted magnetic semiconductors below the nearest-neighbour percolation threshold via realistic Monte Carlo simulations en
heal.type journalArticle en
heal.identifier.primary 10.1016/S0304-8853(00)00499-6 en
heal.identifier.secondary http://dx.doi.org/10.1016/S0304-8853(00)00499-6 en
heal.language English en
heal.publicationDate 2000 en
heal.abstract We have performed Monte Carlo simulations of magnetic semiconductors above and below the nearest-neighbour percolation threshold (NNPT) using a classical Heisenberg Hamiltonian with up to third nearest-neighbour (nn) interactions. Large clusters were created allowing use of realistically low magnetic fields (10 G). Above NNPT our results, apart from confirming the existing picture of this class of materials, also show that the inclusion of the second and third (nn) interactions increases the frustration, thus making the transition temperature smaller and closer to experiment than calculated via the first nn interactions only. A physically plausible explanation is given. Below NNPT our results strongly support the validity of the hypothesis (D. Karaoulanis, J.P. Xanthakis, C. Papatriantafillou, J. Magn. Magn. Mater. 161 (1996) 231), that the experimentally observed susceptibility is the sum of two contributions: a paramagnetic one due to isolated magnetic clusters, and a spin-glass contribution due to an 'infinite' percolative cluster formed from exchange interactions of further than first nearest neighbours. Our calculated phase diagram is in very good agreement with the experiment. (C) 2000 Elsevier Science B.V. All rights reserved. en
heal.publisher ELSEVIER SCIENCE BV en
heal.journalName JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS en
dc.identifier.doi 10.1016/S0304-8853(00)00499-6 en
dc.identifier.isi ISI:000166237100024 en
dc.identifier.volume 221 en
dc.identifier.issue 3 en
dc.identifier.spage 407 en
dc.identifier.epage 413 en


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