Study of the Phase Diagram and the Tc Pressure Dependence for HgBaCuO Superconductors

TL;DR

This paper models the pressure dependence of the critical temperature in HgBaCuO superconductors using an extended Hubbard Hamiltonian and BCS theory, successfully matching experimental data across doping levels.

Contribution

It introduces a method combining the extended Hubbard model and BCS theory to analyze pressure effects on Tc in HgBaCuO superconductors.

Findings

Reproduces experimental Tc dependence across doping regimes.

Effectively models pressure influence on superconducting gap.

Aligns well with observed high and low pressure data.

Abstract

We apply a method recently derived based on the extended Hubbard Hamiltonian and the BCS approach to obtain the superconducting critical temperature dependence with carrier density for the HgBaCuO compounds. We show that this procedure can be used to study pressure effect with the assumption that pressure changes the supercondutor gap. The results reproduce well the experimental data for the whole doping regime and the high and low pressure dependence.