Ferromagnetic ordering in Mn-doped quantum wells GaAs-AlGaAs resulting from the virtual Anderson transition

Journal Article · Wed Aug 20 00:00:00 EDT 2014 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4893519· OSTI ID:22308252

Agrinskaya, N. V.; Berezovets, V. A.; Bouravlev, A.; Kozub, V. I. ^[1]

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1. Ioffe Physical-Technical Institute of the Russian Academy of Sciences, 194021, Saint Petersburg (Russian Federation)

We present our results obtained for Mn-doped GaAs quantum wells where the evidences of the ferromagnetic transition at relatively high temperatures were found at unusually small Mn concentrations. The observed values of hopping resistance at small temperatures evidenced that the samples are deep in the insulating regime. Thus the corresponding estimates of the overlapping integrals can hardly explain the large values of Curie temperatures T{sub c} ≃ 100 K. We develop a theoretical model qualitatively explaining the experimental results basing on the concept of virtual Anderson transition.

• OSTI ID: 22308252
• Journal Information: AIP Conference Proceedings, Vol. 1610, Issue 1; Conference: TIDS15: 15. international conference on transport in interacting disordered systems, Sant Feliu de Guixols (Spain), 1-5 Sep 2013; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALUMINIUM ARSENIDES
CURIE POINT
DOPED MATERIALS
GALLIUM ARSENIDES
QUANTUM WELLS