by Ramos, Miguel
Abstract:
The specific heat Cp and other properties of glasses (ranging from amorphous solids to disordered crystals) at low temperatures are well known to be markedly different from those in fully-ordered crystals. For decades, this qualitative, and even quantitative, universal behavior of glasses has been thoroughly studied. However, a clear understanding of its origin and microscopic nature, needless to say, a closed theory, is still lacking. To shed light on this matter, I review the situation in this work, mainly by compiling and discussing measured low-temperature Cp data of many glasses and disordered crystals, as well as highlighting a few exceptions to that “universality rule”. Thus, one can see that, in contrast to other low-temperature properties of glasses, the magnitude of the “glassy” Cp excess at low temperature is far from being universal. Even worse, some molecular crystals without a clear sign of disorder exhibit linear coefficients in Cp larger than those found in many amorphous solids, whereas a few of the latter show negligible values.
Reference:
Are universal “anomalous” properties of glasses at low temperatures truly universal? (Ramos, Miguel), In Low Temperature Physics, volume 46, 2020.
Bibtex Entry:
@article{ramos_are_2020,
title = {Are universal “anomalous” properties of glasses at low temperatures truly universal?},
volume = {46},
doi = {10.1063/10.0000527},
abstract = {The specific heat Cp and other properties of glasses (ranging from amorphous solids to disordered crystals) at low temperatures are well known to be markedly different from those in fully-ordered crystals. For decades, this qualitative, and even quantitative, universal behavior of glasses has been thoroughly studied. However, a clear understanding of its origin and microscopic nature, needless to say, a closed theory, is still lacking. To shed light on this matter, I review the situation in this work, mainly by compiling and discussing measured low-temperature Cp data of many glasses and disordered crystals, as well as highlighting a few exceptions to that “universality rule”. Thus, one can see that, in contrast to other low-temperature properties of glasses, the magnitude of the “glassy” Cp excess at low temperature is far from being universal. Even worse, some molecular crystals without a clear sign of disorder exhibit linear coefficients in Cp larger than those found in many amorphous solids, whereas a few of the latter show negligible values.},
journal = {Low Temperature Physics},
author = {Ramos, Miguel},
month = feb,
year = {2020},
note = {No CMAM},
pages = {104--110},
file = {Full Text PDF:E:\Usuarios\Administrator\Zotero\storage\2QGQJQXY\Ramos - 2020 - Are universal “anomalous” properties of glasses at.pdf:application/pdf},
}