Temperature-induced pair correlations in clusters and nuclei

S. Frauendorf, N. K. Kuzmenko, V. M. Mikhajlov, and J. A. Sheikh
Phys. Rev. B 68, 024518 – Published 30 July 2003
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Abstract

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.

  • Received 9 May 2003

DOI:https://doi.org/10.1103/PhysRevB.68.024518

©2003 American Physical Society

Authors & Affiliations

S. Frauendorf1,2, N. K. Kuzmenko3, V. M. Mikhajlov4, and J. A. Sheikh2

  • 1Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
  • 2IKH Forschungszentrum Rossendorf, PF 510119, 01324 Dresden, Germany
  • 3V. G. Khlopin Radium Institute, 194021 St. Petersburg, Russia
  • 4Institute of Physics, St. Petersburg State University, 198904 St. Petersburg, Russia

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Vol. 68, Iss. 2 — 1 July 2003

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