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EPR Investigations on the Dynamic Behaviour of Hole Centres in CaWO 4
Author(s) -
Cord B.,
Hofstaetter A.,
Scharmann A.
Publication year - 1981
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221060210
Subject(s) - electron paramagnetic resonance , hyperfine structure , laser linewidth , atomic orbital , materials science , crystallography , condensed matter physics , chemistry , physics , atomic physics , nuclear magnetic resonance , electron , optics , laser , quantum mechanics
By X‐irradiation holes are created in the p‐orbitals of oxygen ligands of the WO 2– 4 complexes of CaWO 4 . These holes are stably trapped at temperatures below 150 K and are characterized by a hyperfine interaction with the W 183 nuclei of two neighboured WO 4 tetrahedra. When raising the temperature from 4.2 to 77 K this interaction changes from an inequivalent to an equivalent one. This thermally activated change is accompanied by a reorientation of the g ‐tensor and a maximum in the EPR linewidth.