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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2016

Lieb-Mattis ferrimagnetism in magnetic semiconductors

Résumé

We show the possibility of long-range ferrimagnetic ordering with a saturation magnetization of similar to 1 mu(B) per spin for arbitrarily low concentration of magnetic impurities in semiconductors, provided that the impurities form a superstructure satisfying the conditions of the Lieb-Mattis theorem. Explicit examples of such superstructures are given for the wurtzite lattice, and the temperature of ferrimagnetic transition is estimated from a high-temperature expansion. Exact diagonalization studies show that small fragments of the structure exhibit enhanced magnetic response and isotropic superparamagnetism at low temperatures. A quantum transition in a high magnetic field is considered and similar superstructures in cubic semiconductors are discussed as well.

Dates et versions

hal-01435096 , version 1 (13-01-2017)

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R. O. Kuzian, J. Richter, M. D. Kuz'Min, R. Hayn. Lieb-Mattis ferrimagnetism in magnetic semiconductors. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2016, 93 (21), ⟨10.1103/PhysRevB.93.214433⟩. ⟨hal-01435096⟩
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