No dia 25 de Setembro de 2023, faremos a migração do Repositório Institucional para a versão 7.6 do sistema DSpace. Por este motivo, o Repositório Institucional ficará indisponível neste dia. Contamos com a compreensão de todos.
Analyses of experimental data for NQR frequency shifts as a function of temperature reveal a dominant T4 dependence at sufficiently low temperature, T ≲ 20°K, in accord with a recent prediction. The results indicate the necessity of adding a Debye term to the usual Bayer expression. The coefficient of the Debye term is shown to vary with TD-5; preliminary results indicate that values of the Debye temperature TD may be obtained from low temperature NQR data.