Superconductor-insulator transition induced by pressure within the X-boson approach

TL;DR

This paper models how pressure influences the superconductor-insulator transition in a modified periodic Anderson model, revealing a transition driven by the chemical potential crossing the hybridization gap.

Contribution

It extends the periodic Anderson model to include attractive interactions and analyzes pressure effects on the phase diagram and transitions.

Findings

Pressure induces a superconductor-insulator transition.

The transition occurs when the chemical potential crosses the hybridization gap.

The model highlights the role of the chemical potential and density of states.

Abstract

The pressure induced superconducting phase diagram is calculated for an extension of the periodic Anderson model (PAM) in the $ U = \infty $ limit taking into account the effect of a nearest neighbor attractive interaction between f-electrons. We analyze the role of the chemical potential compared to several plots of the f-band density of states and we also found a superconductor-insulator transition induced by pressure when the chemical potential crosses the hybridization gap.