Ga(1-x)Mn(x)As: a frustrated ferromagnet.
Starting from a microscopic description of the exchange interaction in Ga(1-x)Mn(x)As, we derive an effective Mn-Mn interaction. Because of the strong spin-orbit coupling in the valence band, this effective interaction is highly anisotropic and has a spatial structure somewhat similar to dipolar interactions. The corresponding ground state has a finite magnetization but is intrinsically spin disordered even at zero temperature, explaining many features of the experimental data. Our results are relevant for many magnetic semiconductors.
Zaránd
Gergely
G
Materials Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60429, USA.
Jankó
Boldizsár
B