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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. ÆäÖй«Ê½2ÊǸù¾Ýƽ¾ù³¡ÀíÂÛËã³öµÄTcΪ400¶à£¬ÆäÖÐk£¬Delta£¨EFM£©=40.1meVÒÑÖª£¬xΪ²ôÔÓÔ×ÓµÄŨ¶È£¬¿ÉÊÇx´ø2/36£¬»òÕß°´ÖÊÁ¿°Ù·ÖÊýËã¶¼ÊÇ5000¶àÁË£¬²»ÖªµÀ´ó¼ÒÓÐÎÞÓùýÕâ¸ö¹«Ê½£¬»òÕßÕâÀï×÷Õß´¦ÀíµÄ²»¶Ô£¿ |
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