Thermodynamical properties of small superconductors with a fixed number of particles
Danilo Gambacurta, Denis Lacroix
DOI 10.1103/PhysRevC.85.044321 · Physical Review C
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Abstract
The variation after projection approach is applied for the first time to the Richardson pairing Hamiltonian to describe the thermodynamics of small superconductors with a fixed number of particles. The minimization of the free energy is made by a direct diagonalization of the entropy. The variation after projection applied at finite temperature provides a perfect reproduction of the exact canonical properties of odd or even systems from very low to high temperatures.
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