Specific Heat Of high-Tc Superconductors Research Articles

Pseudogap and the specific heat of high Tcsuperconductors

The specific heat of a two dimensional repulsive Hubbard model with local interaction is investigated. We use the two-pole approximation which exhibits explicitly important correlations that are sources of the pseudogap anomaly. The interplay between the specific heat and the pseudogap is the main focus of the present work. Our self-consistent numerical results show that above the occupation nT≈0.85, the specific heat starts to decrease due to the presence of a pseudogap in the density of states. We have also observed a two peak structure in the specific heat. Such structure is robust with respect to the Coulomb interaction U but it is significantly affected by the occupation nT. A detailed study of the two peak structure is carried out in terms of the renormalized quasi-particle bands. The role of the second nearest neighbor hopping on the specific heat behavior and on the pseudogap is extensively discussed.

Effect of interlayer interaction on the specific heat of high-Tc superconductors

The effect of interlayer interactions on the electronic specific heat of high-Tc layered superconductors has been studied within the framework of the Hirsch model. In the present paper we extend our previous work in order to evaluate the expression for specific heat. It is shown that the inclusion of interlayer interactions suppresses the height of the jump in the specific heat at Tc.