Comment on Theoretical Description of Carrier Mediated Magnetism in Cobalt Doped ZnO

Abstract

Comment on ``Theoretical Description of Carrier Mediated Magnetism in Cobalt Doped ZnO?? In this Comment, we question the electron-mediated mechanism for magnetic coupling in Co-doped ZnO re- cently proposed by Walsh, Da Silva, and Wei [ 1 ]. Such a mechanism is based on density functional theory (DFT) calculations within a DFT ? U d ? U s approach. Within this approach, Walsh, Da Silva, and Wei introduce ad hoc corrections in order to fit the calculated band structure to what they believe is the experimental one.