Polaronic centres in single crystals
- 17 August 1998
- journal article
- Published by IOP Publishing in Journal of Physics: Condensed Matter
- Vol. 10 (32) , 7293-7302
- https://doi.org/10.1088/0953-8984/10/32/020
Abstract
The autolocalization of free electrons at regular lattice sites, namely at complex anions, has been demonstrated by ESR measurements. It has been shown that the centre is a shallow donor; its energy level is situated meV below the bottom of the conduction band. At temperatures of 50-60 K the captured electrons are detrapped and the formation of other paramagnetic centres occurs. In La-doped , an enhanced cross-section for electron trapping by impurity centres with respect to that for undoped samples is found. In contrast to the case for other tungstates, no intrinsic oxygen hole and/or centres were revealed in . The role of the centres in the processes of transport and recombination of nonequilibrium carriers in the lattice is discussed.Keywords
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