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Página principal > Artículos > Artículos publicados > Depletion of two-level systems in highly stable glasses with different molecular ordering |
Fecha: | 2023 |
Resumen: | 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. |
Ayudas: | Ministerio de Ciencia e Innovación 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 Ministerio de Ciencia e Innovación PID2021-127033OB-C21 |
Derechos: | 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. |
Lengua: | Anglès |
Documento: | Article ; recerca ; Versió publicada |
Materia: | Boson peaks ; Configurational entropy ; Highly stables ; Kinetics and thermodynamics ; Lows-temperatures ; Molecular ordering ; Physical vapour deposition ; Stable state ; Structural glass ; Two-level system |
Publicado en: | Communications Physics, Vol. 6 (September 2023) , art. 274, ISSN 2399-3650 |
9 p, 1.5 MB |