Mottness in a doped organic superconductor

TL;DR

This study investigates how pressure influences a doped organic superconductor, revealing a potential quantum phase transition linked to Mott physics and non-Fermi liquid behavior, expanding understanding of correlated electron systems.

Contribution

It extends the Mott transition framework to doped systems and demonstrates pressure-induced changes in superconductivity and electronic correlations.

Findings

Superconductivity peaks near a critical pressure.

Non-Fermi liquid behavior observed around the transition.

Evidence suggests a quantum phase transition between correlated regimes.

Abstract

We report the pressure study of a doped organic superconductor with Hall coefficient and conductivity measurements. We find that maximally enhanced superconductivity and a non-Fermi liquid appear around a certain pressure where mobile carriers increase critically, suggesting a possible quantum phase transition between strongly and weakly correlated regimes. Our description extends the conventional picture of a Mott metal-insulator transition at half filling to the case of a doped Mott insulator with tunable correlation.