The electronic and magnetic properties of （Mn,C）-codoped ZnO diluted magnetic semiconductor

The electronic and magnetic properties of （Mn,C）-codoped ZnO are studied in the Perdew Burke-Ernzerhof form of generalized gradient approximation of the density functional theory. By investigating five geometrical configurations, we find that Mn doped ZnO exhibits anti-ferromagnetic or spin-glass behaviour, and there are no carriers to mediate the long range ferromagnetic （FM） interaction without acceptor co-doping. We observe that the FM interaction for （Mn,C）-codoped ZnO is due to the hybridization between C 2p and Mn 3d states, which is strong enough to lead to hole-mediated ferromagnetism at room temperature. Meanwhile, we demonstrate that ZnO co-doped with Mn and C has a stable FM ground state and show that the （Mn,C）-codoped ZnO is FM semiconductor with super-high Curie temperature （Tc =5475 K）. These results are conducive to the design of dilute magnetic semiconductors with codopants for spintronics applications.