Electron paramagnetic resonance study of the Eu2+ ion in a PbWO4 single crystal

The electron paramagnetic resonance of the Eu2+ ion in a PbWO4 single cryst al, grown by the Czochralski method, has been investigated using an X-band spectrometer. The rotation patterns in the crystallographic planes together with spin-Hamiltonian parameters of Eu2+ show that the local site symmetry of the Eu2+ ion is tetragonal. The spectroscopic splitting tensor g, zero- field splitting parameters B-k(q), and hyperfine tensor A are determined wi th the effective spin Hamiltonian. Energy levels of the ground state for Eu 2+ embedded in the PbWO4 crystal are calculated. It turns out that the Eu2 ion substitutes for the Pb2+ ion without any charge compensation. (C) 2000 American Institute of Physics. [S0021-8979(00)07103-6].