Superconductivity at 41.0 K in the F-doped LaFeAsO1-xFx

TL;DR

This paper reports the achievement of a 41.0 K superconducting transition temperature in F-doped LaFeAsO synthesized under high pressure, surpassing previous ambient pressure results due to lattice shrinkage and enhanced chemical pressure.

Contribution

It demonstrates that high pressure synthesis can significantly increase Tc in LaFeAsO1-xFx by inducing lattice shrinkage and stronger chemical pressure.

Findings

Superconductivity at 41.0 K achieved in LaFeAsO1-xFx

High pressure synthesis enhances Tc beyond ambient methods

Lattice shrinkage correlates with increased Tc

Abstract

Here we report the superconductivity in the LaFeAsO1-xFx system prepared by high pressure synthesis. The highest onset superconducting transition temperature (Tc) in this La-based system is 41.0 K with the nominal composition of LaFeAsO1-xFx (x = 0.6), which is higher than that reported previously by ambient pressure synthesis. The increase of Tc can be attributed to the further shrinkage of crystal lattice that causes the stronger chemical pressure on the Fe-As plane, which is induced by the increased F-doping level under high pressure synthesis.