Lieb-Mattis ferrimagnetism in diluted magnetic semiconductors
| Autor: | Kuzian, R. O., Richter, J., Kuz'min, M. D., Hayn, R. |
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| Rok vydání: | 2016 |
| Předmět: | |
| Zdroj: | Phys. Rev. B 93, 214433 (2016) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.93.214433 |
| Popis: | 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. Comment: 6 pages,4 figures |
| Databáze: | arXiv |
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