A variational study of periodic Anderson model with superconducting correlations

In this work, we present the study of heavy fermion superconductivity represented by the extended periodic Anderson model (PAM), which includes a superconducting correlations term. The study has been carried out at finite U as well as at U -> infinity. We have used the variational method. The variational wave function contains two variational parameters A(k sigma), and B-k sigma, corresponding to, respectively, single and simultaneously two electrons transfer from conduction band to f-band and back. We have found that both the variational parameters are mutually dependent. We have found that T-c, increases as a function of J (interaction parameter). (c) 2006 Published by Elsevier Ltd.