Aguileranavarro, V. C.Dellano, M.Plastino, A.Rossignoli, R.2014-05-202014-05-201991-01-01Zeitschrift Fur Physik A-hadrons and Nuclei. New York: Springer Verlag, v. 340, n. 1, p. 35-39, 1991.0939-7922http://hdl.handle.net/11449/38813We 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 which some 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.35-39engArtigo10.1007/BF01284478WOS:A1991GC87300006Acesso restrito