Landau's Model of Liquid
- 1 April 1959
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 114 (1), 21-26
- https://doi.org/10.1103/physrev.114.21
Abstract
Landau's model of liquid as a Fermi liquid is studied with regard to its lowest temperature properties. Primary stress is laid on the coefficient of thermal expansion. The spectra used by Abrikosov and Khalatnikov, the perfect-gas type and "bubble" type, are shown to give a positive coefficient of thermal expansion, in contradiction with experiment. An alternative simple spectrum is suggested which can give a negative coefficient of thermal expansion, namely . In addition, the existence of a negative coefficient of thermal expansion is shown to imply a strong temperature dependence of the energy spectrum, which may cause a sharp deviation of the heat capacity curve from the perfect-gas type, similar to the deviations observed in liquid .