Depletion of two-level systems in highly stable glasses with different molecular ordering
Moratalla Martín, Manuel (Universidad Autónoma de Madrid)
Rodríguez López, Marta (Universitat Autònoma de Barcelona. Departament de Física)
Rodríguez-Tinoco, Cristian (Institut Català de Nanociència i Nanotecnologia)
Rodríguez-Viejo, Javier (Institut Català de Nanociència i Nanotecnologia)
Jiménez Riobóo, Rafael J. (Instituto de Ciencia de Materiales de Madrid)
Ramos, Miguel Ángel (Universidad Autónoma de Madrid. Departamento de Física de la Materia Condensada)

Date:	2023
Abstract:	Recent findings of structural glasses with extremely high kinetic and thermodynamic stability have attracted much attention. The question has been raised as to whether the well-known, low-temperature "glassy anomalies" (attributed to the presence of two-level systems [TLS] and the "boson peak") persist or not in these ultrastable glasses of much lower configurational entropy. To resolve previous contradictory results, we study a particular type of ultrastable glass, TPD, which can be prepared by physical vapor deposition in a highly-stable state with different degrees of layering and molecular orientation, and also as a conventional glass and in crystalline state. After a thorough characterization of the different samples prepared, we have measured their specific heat down to 0. 4 K. Whereas the conventional glass exhibits the typical glassy behaviour and the crystal the expected Debye cubic dependence at very low temperatures, a strong depletion of the TLS contribution is found in both kinds of ultrastable glass, regardless of their layering and molecular ordering.
Grants:	Agencia Estatal de Investigación PID2021-127498NB-I00 Ministerio de Ciencia e Innovación CEX2018-000805-M Agencia Estatal de Investigación PID2020-117409RB-I00 Ministerio de Ciencia e Innovación CEX2021-001214-S Agencia Estatal de Investigación PID2021-127033OB-C21
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Boson peaks ; Configurational entropy ; Highly stables ; Kinetics and thermodynamics ; Lows-temperatures ; Molecular ordering ; Physical vapour deposition ; Stable state ; Structural glass ; Two-level system
Published in:	Communications Physics, Vol. 6 (September 2023) , art. 274, ISSN 2399-3650

DOI: 10.1038/s42005-023-01398-4

9 p, 1.5 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles