Abstract
We examine a Lipkin based two-level pairing model at finite temperature and in the thermodynamic limit. Whereas at T=0 the model exhibits a superconducting ground state for sufficiently high values of the coupling constant, a partially superconducting phase in whichsome of the particles are paired, is found to survive at high temperatures in a special treatment. This phase is a mixture of “abnormally-occupied” eigenstates, which lie at higher energy, of the interactionless model Hamiltonian.
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On leave from Physics Department, North Dakota State University, Fargo, ND 58105, USA
On leave from Universidad Nacional de La Plata, Argentina
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Aguilera-Navarro, V.C., de Llano, M., Plastino, A. et al. High temperature superfluidity with abnormal fermionic occupancy. Z. Physik A - Hadrons and Nuclei 340, 35–39 (1991). https://doi.org/10.1007/BF01284478
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DOI: https://doi.org/10.1007/BF01284478