Hyperfine interactions in 111Cd-doped lutetium sesquioxide

L.A.ERRICO; M. RENTERÍA; A.G. BIBILONI; F.G. REQUEJO

HYPERFINE INTERACTIONS

Kluwer Pub

Lugar: Dordrecht; Año: 1999 vol. 120 p. 457 - 462

0304-3843

Vol. 120/121We report here first Perturbed Angular Correlation (PAC) results of the electric field gradient (EFG) characterisation at 111Cd impurities located at both non-equivalent cation sites of the bixbyite structure of Lutetium sesquioxide, between room temperature (RT) and 1273 K. The comparison with results coming from a systematic 111Cd PAC study in bixbyites and with point-charge model (PCM) predictions shows the presence of a trapped defect at RT in the neighbourhood of the asymmetric cation site, which is completely removed at T > 623 K. The anomalous EFG temperature dependence in Lu2O3 can be described in the frame of a ?two-state? model with fluctuating interactions, which enables the experimental determination of the acceptor energy level introduced by the Cd impurity in the band-gap of the semiconductor and the estimation of the oxygen vacancy density in the sample.