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EPR spectroscopy of weak exchange interactions between Co 2+ ions in ZnO
Author(s) -
Azamat D. V.,
Dejneka A.,
Trepakov V. A.,
Jastrabik L.,
Fanciulli M.,
Ivanov V. Y.,
Godlewski M.,
Sokolov V. I.,
Rosa J.,
Badalyan A. G.
Publication year - 2011
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201105014
Subject(s) - electron paramagnetic resonance , spins , exchange interaction , ion , chemistry , dimer , spectroscopy , hamiltonian (control theory) , paramagnetism , crystallography , condensed matter physics , atomic physics , nuclear magnetic resonance , physics , ferromagnetism , mathematical optimization , mathematics , organic chemistry , quantum mechanics
Electron paramagnetic resonance (EPR) is used to identify the next nearest neighbour Co 2+ 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 S eff = 1/2 of the lowest ground state Kramers doublets of the two Co 2+ ions. The exchange parameters of weakly ferromagnetically coupled next nearest neighbor Co 2+ pairs are estimated. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)