A systematic study on the magnetic and electrical transport properties of single-phase wurtzite Zn1-x Cux O is performed. Efros variable range hopping dominates the conduction, which is accompanied by a ferromagnetic order up to 700 K for x>1%. Both the first-principles calculations and Cu/Al co-doping experiments suggest that the spontaneous spin polarization originates from the p- d exchange interaction between O 2p and Cu3d orbitals. Furthermore, our results are consistent with the scenario that the intrinsic ferromagnetism is established through indirect interassctions between bound magnetic polarons mediated by magnetic impurities.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)