Anomalous specific heat jump in a two-component ultracold Fermi gas

Details Anomalous specific heat jump in a two-component ultracold Fermi gas Anomalous specific heat jump in a two-component ultracold Fermi gas

2006-05-03

arxiv.org/abs/cond-mat/0605085v3

Phys.Rev.Lett.97:140404,2006

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures. v2 includes a discussion of instabilities; v3: final version to appear in PRL

Scientific paper

10.1103/PhysRevLett.97.140404

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 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.

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