Abstract:
By using highly sensitive millikelvin superconducting quantum interference device magnetometry, the magnitude of the Curie temperature as a function of the Mn concentration
x is determined for thoroughly characterized Ga
1−xMn
xN. The interpretation of the results in the frame of tight-binding theory and of Monte Carlo simulations allows us to assign the spin interaction to ferromagnetic superexchange and to point out the limited accuracy of state-of-the-art
ab initio methods in predicting the magnetic characteristics of dilute magnetic insulators.
Notes:
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