Evidence for Two Different Kinds of Two Level Systems in Lithium Borate Glasses
In Stuttgart  we presented echo experiments performed on a family of borate glasses with the general composition: B2O3, x Li2O, y LiCl. We mentioned on that occasion that the echoes we obtained presented some puzzling features which are not in agreement with the expected standard behavior of phonon echoes in glassy systems as observed by other groups .
KeywordsLithium Attenuation Borate LiCl B2O3
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