期刊
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS
卷 44, 期 28-32, 页码 L948-L951出版社
JAPAN SOC APPLIED PHYSICS
DOI: 10.1143/JJAP.44.L948
关键词
dilute magnetic semiconductor; spinodal decomposition phase; concentration fluctuation; chemical pair interaction; percolation; Curie temperature
We show that spinoadal decomposition phase in dilute magnetic semiconductors (DMS) offers the possibility to have high Curie temperatures (T-C) even if the magnetic exchange interaction is short ranged. The spinodal decomposition is simulated by applying the Monte Carlo method to the Ising model with realistic (ab initio) chemical pair interactions between magnetic impurities in DMS. Curie temperatures are estimated by the random phase approximation with taking disorder into account. It is found that the spinodal decomposition phase inherently occurs in DMS due to strong attractive interactions between impurities. This phase decomposition supports magnetic network over the dimension of the crystal resulting in a high-T-C phase.
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