Do tunneling states and boson peak persist or disappear in extremely stabilized glasses?

M.A. Ramos; T. Pérez-Castañeda; R.J. Jiménez-Riobóo; C. Rodríguez-Tinoco; J. Rodríguez-Viejo

Authors

M.A. Ramos Laboratorio de Bajas Temperaturas, Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, E-28049 Madrid, Spain
T. Pérez-Castañeda Laboratorio de Bajas Temperaturas, Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, E-28049 Madrid, Spain
R.J. Jiménez-Riobóo Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas (ICMM-CSIC), E-28049 Madrid, Spain
C. Rodríguez-Tinoco Nanomaterials and Microsystems Group, Physics Department, and MATGAS Research Centre, Universitat Autónoma de Barcelona, E-08193 Bellaterra, Barcelona, Spain
J. Rodríguez-Viejo Nanomaterials and Microsystems Group, Physics Department, and MATGAS Research Centre, Universitat Autónoma de Barcelona, E-08193 Bellaterra, Barcelona, Spain

Keywords:

indomethacin, ultrastable glass, two-level system, the glass transition

Abstract

We have investigated how extreme thermal histories in glasses can affect their universal properties at low temperatures. In particular, we have studied two materials which allow us to access highly-stable glassy states, as well as their corresponding conventional glasses, in two different ways: (i) amber [1], 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 [2] (an organic molecule commonly used in pharmaceuticals), prepared by physical vapor deposition at temperatures around 85% of its glass-transition temperature.