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EPR spectroscopy of weak exchange interactions between Co2+ ions in ZnO |
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| Authors: | D V Azamat A Dejneka V A Trepakov L Jastrabik M Fanciulli V Y Ivanov M Godlewski V I Sokolov J Rosa A G Badalyan |
| Institution: | 1. Institute of Physics, Academy of Sciences of the Czech Republic, 18221 Prague, Czech Republic;2. Ioffe Physical‐Technical Institute, 194021 St. Petersburg, Russia;3. Laboratorio MDM, IMM‐CNR, 20041 Agrate Brianza (MB), Italy;4. Dipartimento di Scienza dei Materiali, Universita degli studi di Milano‐Bicocca, 20125 Milano, Italy;5. Institute of Physics, Polish Academy of Sciences, Warsaw 02‐668, Poland;6. Dept. Mathematics and Natural Sciences College of Science, Cardinal S. Wyszynski University, Warsaw, Poland;7. Institute of Metal Physics, UD RAS, 620041 Yekaterinburg, Russia |
| Abstract: | Electron paramagnetic resonance (EPR) is used to identify the next nearest neighbour Co2+ pairs coupled by spin–spin interaction in Co‐doped ZnO single crystals grown by the hydrothermal technique. These dimer centers are described by a spin Hamiltonian with exchange coupling terms written as interaction between identical effective spins Seff = 1/2 of the lowest ground state Kramers doublets of the two Co2+ ions. The exchange parameters of weakly ferromagnetically coupled next nearest neighbor Co2+ pairs are estimated. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) |
| Keywords: | transition metals EPR ZnO exchange interactions magnetism |