Do tunneling states and boson peak persist or disappear in extremely stabilized glasses?
M.A. Ramos and T. Pérez-Castañeda
Laboratorio de Bajas Temperaturas, Departamento de Física de la Materia Condensada Condensed Matter Physics Center (IFIMAC) and Instituto de Ciencia de Materiales “Nicolás Cabrera” Universidad Autónoma de Madrid, Cantoblanco, Madrid E-28049, Spain
Instituto de Ciencia de Materiales de Madrid (ICMM-CSIC), Cantoblanco, Madrid E-28049, Spain
C. Rodríguez-Tinoco and J. Rodríguez-Viejo
Nanomaterials and Microsystems Group, Physics Department, and MATGAS Research Centre Universitat Autónoma de Barcelona, Bellaterra E-08193, Barcelona, Spain
Received September 4, 2014
We review and concurrently discuss two recent works conducted by us, which apparently give opposite results. Specifically, we have investigated how extreme thermal histories in glasses can affect their universal properties at low temperatures, by studying: (i) amber, the fossilized natural resin, which is a glass which has experienced a hyperaging process for about one hundred million years; and (ii) ultrastable thin-film glasses of indomethacin. Specific heat Cp measurements in the temperature range 0.07 K < T < 30 K showed that the amount of two-level systems, assessed from the linear term at the lowest temperatures, was exactly the same for the pristine hyperaged amber glass as for the subsequently rejuvenated samples, whereas just a modest increase of the boson-peak height (in Cp/T3) with increasing rejuvenation was observed, related to a corresponding increase of the Debye coefficient. On the other hand, we have observed an unexpected suppression of the two-level systems in the ultrastable glass of indomethacin, whereas conventionally prepared thin films of the same material exhibit the usual linear term in the specific heat below 1 K ascribed to these universal two-level systems in glasses. By comparing both highly-stable kinds of glass, we conclude that the disappearance of the tunneling two-level systems in ultrastable thin films of indomethacin may be due to the quasi-2D and anisotropic behavior of this glass, what could support the idea of a phonon-mediated interaction between two-level systems.
PACS: 65.60.+a Thermal properties of amorphous solids and glasses: heat capacity, thermal expansion, etc.; PACS: 64.70.P– Glass transitions of specific systems; PACS: 63.50.Lm Glasses and amorphous solids; PACS: 81.40.Cd Solid solution hardening, precipitation hardening, and dispersion hardening; aging.
Key words: low-temperature thermal properties of glasses; specific heat; glass transition; tunneling two-level systems; ultrastable glasses