Pseudogap and the specific heat of high $T_c$ superconductors

Abstract

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 $n_T\approx 0.85$, 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 $n_T$. 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.

6 pages, 6 figures, accepted for publication in Solid State Communications

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• Influence of Spatial Correlations in Strongly Correlated Electron Systems: Extension to Dynamical Mean Field Approximation
• Doping-dependent evolution of low-energy excitations and quantum phase transitions within effective model for High-Tc copper oxides
• Emergence of non-Fermi-liquid behavior due to Fermi surface reconstruction in the underdoped cuprate superconductors

Cited by in corpus (2)

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