✦ LIBER ✦

On the origin of the lambda-type transition in heat capacity

✍ Scribed by R.J. Thorn

Publisher: Elsevier Science
Year: 2002
Tongue: English
Weight: 229 KB
Volume: 34
Category: Article
ISSN: 0021-9614
DOI: 10.1006/jcht.2001.0947

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✦ Synopsis

The lambda-type transition in the variation of heat capacity with temperature consists of a narrow asymmetric maximum in phonon-driven heat capacity. Although it was not so labeled at the time, "the specific heat singularity in solid NH 4 Cl", obtained by Simon in 1922 was the first true λ-anomaly to be discovered. Thereafter, the transition was discovered over a period of years in several cases. Sometime along the way, probably after its discovery in 4 He, it became identified as the lambda-type transition. Analyses of the anomaly are effected in an attempt to find its origin and the parameters that characterize it.

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