Temperature-induced pair correlations in cluster and nuclei


Temperature-induced pair correlations in cluster and nuclei

Frauendorf, S.; Kuzmenko, N. K.; Mikhailov, V. M.; Sheikh, J. A.

The pair correlations in mesoscopic systems such as nanometer-size superconducting clusters and nuclei are studied at a 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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Publ.-Id: 5818