Some ultrastable glasses films had been observed to lack the “universal” low-temperature anomalies of glasses, but the role of their anisotropy was unclear. In this article, by measuring the specific heat of an organic material in different glassy states at low temperatures, it is shown that the suppression of two-level systems in glasses depends on the degree of stability, not on anisotropy.
- Manuel Moratalla
- Marta Rodríguez-López
- Miguel A. Ramos
