Bulletin of the American Physical Society
APS March Meeting 2021
Volume 66, Number 1
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session X02: Molecular Glasses
8:00 AM–11:00 AM,
Friday, March 19, 2021
Sponsoring
Units:
DPOLY DSOFT DCP DMP
Chair: Michael Tylinski , Wentworth Institute of Technology
Abstract: X02.00006 : Specific heat at low temperatures of ultrastable glasses of TPD
9:24 AM–9:36 AM
Live
Presenter:
Miguel Ramos
(Condensed Matter Physics Department, Universidad Autonoma de Madrid)
Authors:
Manuel Moratalla
(Condensed Matter Physics Department, Universidad Autonoma de Madrid)
Marta Rodriguez-Lopez
(Physics Department, Univ Autonoma de Barcelona)
Cristian Rodriguez-Tinoco
(Physics Department, Univ Autonoma de Barcelona)
Javier Rodriguez-Viejo
(Physics Department, Univ Autonoma de Barcelona)
Rafael J. Jimenez-Rioboo
(Instituto de Ciencia de Materiales de Madrid, CSIC)
Miguel Ramos
(Condensed Matter Physics Department, Universidad Autonoma de Madrid)
Interestingly, our earlier low-temperature specific-heat measurements on (highly anisotropic) ultrastable glasses of indomethacin prepared by Physical Vapour Deposition (PVD) [2] showed the suppression of the ubiquitous linear term below 1-2 K traditionally ascribed to the existence of tunneling two-level systems (TLS) in glasses [3]. This finding apparently challenged the opposite behavior found in hyperaged glasses of geological amber [4].
Here we will present the results of our ongoing experiments of low-temperature specific heat, as well as of Brillouin Scattering, on a different ultrastable glass, TPD, whose degree of anisotropy can be controlled. We aim at comparing its behavior at low temperatures to that of its conventional glass and crystalline states.
[1] W. A. Phillips, ed., Amorphous Solids, Low-Temperature Properties, Springer (1981)
[2] M. D. Ediger, J. Chem. Phys. 147, 210901 (2017)
[3] T. Pérez-Castañeda, C. Rodríguez-Tinoco, J. Rodríguez-Viejo, M. A. Ramos, PNAS 111, 11275 (2014)
[4] T. Pérez-Castañeda, R. J. Jiménez-Riobóo, M. A. Ramos, Phys. Rev. Lett. 112, 165901 (2014)
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