Temperature Dependence of the Superfluid Density in a Noncentrosymmetric Superconductor

TL;DR

This paper investigates how the superfluid density in a noncentrosymmetric superconductor like CePt3Si varies with temperature, using a two-component pairing model to explain experimental observations of the penetration depth.

Contribution

It introduces a Cooper pairing model with mixed singlet and triplet components to explain the temperature dependence of superfluid density in CePt3Si.

Findings

The model reproduces the line-node-gap behavior at low temperatures.

Superfluid density tensor calculations align with experimental data.

The approach advances understanding of pairing mechanisms in noncentrosymmetric superconductors.

Abstract

For a noncentrosymmetric superconductor such as CePt3Si, we consider a Cooper pairing model with a two-component order parameter composed of spin-singlet and spin-triplet pairing components. We calculate the superfluid density tensor in the clean limit on the basis of the quasiclassical theory of superconductivity. We demonstrate that such a pairing model accounts for an experimentally observed feature of the temperature dependence of the London penetration depth in CePt3Si, i.e., line-node-gap behavior at low temperatures.