Electronic specific heat in the normal state of cuprate high-Tc superconductors

TL;DR

This paper uses the composite operator method to calculate the specific heat of the 2D Hubbard model, showing it aligns with experimental data for cuprate high-Tc superconductors and supports a Fermi liquid and van Hove scenario in the overdoped regime.

Contribution

It provides a detailed theoretical analysis of the specific heat in the normal state of cuprates using the 2D Hubbard model, linking it to experimental observations.

Findings

Model reproduces experimental specific heat behavior

Supports Fermi liquid and van Hove scenario in overdoped cuprates

Suggests connection between specific heat and spin susceptibility data

Abstract

By means of the composite operator method we calculate the specific heat of the 2D Hubbard model. Our results show that the model gives a detailed description of the experimental situation in the normal state of cuprate high Tc superconductors. The observed behavior is consistent with a Fermi liquid picture where the unusual properties are described in terms of the van Hove scenario. There is experimental evidence, based on the data for the spin magnetic susceptibility and specific heat, that this scenario is related to the overdoped region where superconductivity is depressed.