Phys. Rev. Lett. 97, 140404 (2006) [4 pages]
Anomalous Specific-Heat Jump in a Two-Component Ultracold Fermi Gas
Abstract
References (44)
Citing Articles
Armen Sedrakian, 1 Herbert Müther, 1 and Artur Polls21Institute for Theoretical Physics, Tübingen University, D-72076 Tübingen, Germany
2Departament d'Estructura i Constituents de la Matèria, Universitat de Barcelona, E-08028 Barcelona, Spain
Received 3 May 2006; published 4 October 2006
The thermodynamic functions of a Fermi gas with spin population imbalance are studied in the temperature-asymmetry plane in the BCS limit. The low-temperature domain is characterized by an anomalous enhancement of the entropy and the specific heat above their values in the unpaired state, decrease of the gap and eventual unpairing phase transition as the temperature is lowered. The unpairing phase transition induces a second jump in the specific heat, which can be measured in calorimetric experiments. While the superfluid is unstable against a supercurrent carrying state, it may sustain a metastable state if cooled adiabatically down from the stable high-temperature domain. In the latter domain the temperature dependence of the gap and related functions is analogous to the predictions of the BCS theory.
©2006 The American Physical Society
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