The anelastic spectrum of the Nb 1-xZr xD y alloy has been studied in the high dilution limit, down to x = 1300 ppm and y = 150 ppm. It was thus possible to single out the peaks associated with the most symmetric four-level systems (FLS). A narrow peak at 6 K (40 kHz) has been identified with the transitions between the intermediate levels of the FLS. The fact that such transitions are much slower than those between levels 1 and 4 and are not caused by the scattering with the conduction electrons is explained in terms of a vanishing matrix element for first order transitions involving the intermediate states of a centrosymmetric FLS.
Anelastic spectroscopy study of very diluted Zr-D tunnel systems in Nb single crystals
Cordero F.;Paolone A.;
2002
Abstract
The anelastic spectrum of the Nb 1-xZr xD y alloy has been studied in the high dilution limit, down to x = 1300 ppm and y = 150 ppm. It was thus possible to single out the peaks associated with the most symmetric four-level systems (FLS). A narrow peak at 6 K (40 kHz) has been identified with the transitions between the intermediate levels of the FLS. The fact that such transitions are much slower than those between levels 1 and 4 and are not caused by the scattering with the conduction electrons is explained in terms of a vanishing matrix element for first order transitions involving the intermediate states of a centrosymmetric FLS.| File | Dimensione | Formato | |
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