title: Hydrogen-mediated spin-spin interaction in ZnCoO.
abstract: The effect of hydrogen impurities on the electronic and magnetic properties of ZnO-based diluted magnetic semiconductors is examined through first-principles pseudopotential calculations. We suggest that interstitial H can mediate a strong short-ranged ferromagnetic spin-spin interaction between neighboring magnetic impurities through the formation of a bridge bond. Results based on first-principles total-energy calculations and Monte Carlo simulations indicate that such H-mediated spin-spin interactions can lead to high temperature ferromagnetism.
authors.affiliation: Research Center for Dielectric and Advanced Matter Physics and Department of Physics, Pusan National University, San-30 Jangjun, Geumjung, Pusan 609-735, Korea.
authors.forename: C H
authors.initials: CH
authors.lastname: Park
authors.forename: D J
authors.initials: DJ
authors.lastname: Chadi