Interplay between condensation energy, pseudogap and the specific heat of a Hubbard model in a n-pole approximation
| Autor: | A. C. Lausmann, A. Troper, S. G. Magalhaes, C. M. Chaves, E. J. Calegari |
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| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Physics
Superconductivity Condensed Matter::Quantum Gases Work (thermodynamics) Strongly Correlated Electrons (cond-mat.str-el) Hubbard model Condensed matter physics Condensed Matter - Superconductivity Condensation FOS: Physical sciences Condensed Matter Physics Atomic and Molecular Physics and Optics Superconductivity (cond-mat.supr-con) Condensed Matter - Strongly Correlated Electrons Pairing Condensed Matter::Superconductivity Jump Antiferromagnetism General Materials Science Condensed Matter::Strongly Correlated Electrons Pseudogap |
| Popis: | 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 $(\pi,\pi)$ on the renormalized bands. It is observed that above a given total occupation $n_T$, the specific heat jump $\Delta C$ and also the condensation energy $U(0)$ decrease signaling the presence of the pseudogap. Comment: Accepted for publication in Journal of Low Temperature Physics |
| Databáze: | OpenAIRE |
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