Journal
PHYSICAL REVIEW LETTERS
Volume 85, Issue 21, Pages 4610-4613Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.85.4610
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We calculate the electronic states of the Mn-doped semiconductors and show that resonant states are formed at the top of the down spin valence band due to magnetic impurities and that they give rise to a strong and long-ranged ferromagnetic coupling between Mn moments. We propose that the coupling of the resonant states, in addition to the intra-atomic exchange interaction between the resonant and nonbonding states, is the origin of the ferromagnetism of (Ga-Mn)As. The mechanism is thus called double resonance. The resonant states bring about the spin-dependent resistivity to produce magnetoresistive properties in (Ga-Mn)As and their junctions.
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