Lieb-Mattis ferrimagnetism in magnetic semiconductors

Article

关键词: FERROMAGNETISM;    STEPS;    ANISOTROPY;    EXCHANGE;    ORDER;   

DOI  :  10.1103/PhysRevB.93.214433

来源: SCIE

【 摘 要 】

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.

【 授权许可】

Free