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ÔÚһƪÎÄÕÂÖп´µ½ Furthermore, it is clear that the energy
difference 1EFM (40.1 meV) between AFM and FM states is very
large for configuration II (1, 3). The Curie temperature (TC ) can
be estimated with the classical Heisenberg model in mean-field
theory [23]
kBTC = 21EFM/3x (2)
where x is the concentration of doping atoms and kB is Boltzmann¡¯s
constant. By Eq. (2), the Curie temperature (TC ) of Cu-doped CdS is
obtained. It is about TC = 400 K and higher than room temperature
in Cu-doped ZnO DMSs [24] and Cu-doped GaN [25] respectively.
These results illustrate that Cu-doped CdS is a more promising
spintronics material.
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