Temperature-induced pair correlations in clusters and nuclei

Details Temperature-induced pair correlations in clusters and nuclei Temperature-induced pair correlations in clusters and nuclei

2003-01-16

arxiv.org/abs/physics/0301036v1

Physics

Atomic and Molecular Clusters

Scientific paper

10.1103/PhysRevB.68.024518

The pair correlations in mesoscopic systems such as $nm$-size superconducting clusters and nuclei are studied at finite temperature for the canonical ensemble of fermions in model spaces with a fixed particle number: i) a degenerate spherical shell (strong coupling limit), ii) an equidistantly spaced deformed shell (weak coupling limit). It is shown that after the destruction of the pair correlations at T=0 by a strong magnetic field or rapid rotation, heating can bring them back. This phenomenon is a consequence of the fixed number of fermions in the canonical ensemble.

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