Interplay between condensation energy, pseudogap and the specific heat of a Hubbard model in a n-pole approximation

The condensation energy and the specific heat jump of a two-dimensional Hubbard model, suitable to discuss high-$T_c$ superconductors, is studied. In this work, the Hubbard model is investigated by the Green's function method within a $n$-pole approximation, which allows to consider superconductivity with $d_{x^2-y^2}$-wave pairing. In the present scenario, the pseudogap regime emerges when the antiferromagnetic (AF) correlations become sufficiently strong to move to lower energies the region around of the nodal point $(π,π)$ on the renormalized bands. It is observed that above a given total occupation $n_T$, the specific heat jump $ΔC$ and also the condensation energy $U(0)$ decrease signaling the presence of the pseudogap.

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