Temperature-induced pair correlations in clusters and nuclei

Abstract

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.

References in corpus (3)

• Spectroscopy of discrete energy levels in ultrasmall metallic grains
• Gate-Voltage Studies of Discrete Electronic States in Al Nanoparticles
• Paramagnetic Breakdown of Superconductivity in Ultrasmall Metallic Grains

Cited by in corpus (15)

• Effects of symmetry breaking in finite quantum systems
• The nuclear moment of inertia and spin distribution of nuclear levels
• Exact and approximate ensemble treatments of thermal pairing in a multilevel model
• Pairing within the self-consistent quasiparticle random-phase approximation at finite temperature
• Pairing in hot rotating nuclei
• Pairing reentrance in hot rotating nuclei
• Re-appearance of the pairing correlations at finite temperature
• Pairing Reentrance Phenomenon in Heated Rotating Nuclei in the Shell Model Monte Carlo Approach
• Giant dipole resonance in ${}^{201}$Tl at low temperature
• Survival of parity effects in superconducting grains at finite temperature
• Shell model study of the pairing correlations
• Test of a modified BCS theory performance in the Picket Fence Model
• Nuclear pairing at finite temperature and angular momentum
• Temperature and angular momentum dependence of the quadrupole deformation in sd-shell
• Thermal nuclear pairing within the self-consistent quasiparticle RPA