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arXiv · 1602.02239

Lieb-Mattis ferrimagnetism in diluted magnetic semiconductors

R. O. Kuzian·J. Richter·M. D. Kuz'min·R. Hayn
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Abstract

We show the possibility of long-range ferrimagnetic ordering with a saturation magnetisation of the order of 1 Bohr magneton 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.

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R. O. Kuzian, J. Richter, M. D. Kuz'min, R. Hayn. 2016-02-06. Lieb-Mattis ferrimagnetism in diluted magnetic semiconductors. https://doi.org/10.1103/physrevb.93.214433

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