Origin of low-temperature tunneling states in glasses

Morrel H. Cohen, G. S. Grest

Research output: Contribution to journalArticlepeer-review

99 Scopus citations


The low-temperature tunneling levels observed in glasses are discussed in terms of the free-volume model. As the system falls out of thermodynamic equilibrium near its glass transition temperature Tg, liquid clusters are frozen in. This Letter proposes that voids are formed within the liquid clusters as they in turn freeze at lower temperatures. Approximately 10-4 such centers form per atom, 1% of which contribute to the heat capacity below 1 K.

Original languageEnglish (US)
Pages (from-to)1271-1274
Number of pages4
JournalPhysical review letters
Issue number15
StatePublished - 1980
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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