Nuclear Magnetic Relaxation Rate in a Noncentrosymmetric Superconductor

TL;DR

This paper models the nuclear magnetic relaxation rate in noncentrosymmetric superconductors like CePt3Si, explaining experimental features such as the peak below Tc and low-temperature line-node gap behavior.

Contribution

It introduces a Cooper pairing model with mixed singlet and triplet components to qualitatively explain relaxation rate observations.

Findings

Reproduces the peak in 1/T1 just below Tc

Accounts for line-node gap behavior at low temperatures

Provides a qualitative understanding of experimental data

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 demonstrate that such a model on a qualitative level accounts for experimentally observed features of the temperature dependence of the nuclear spin-lattice relaxation rate 1/T1, namely a peak just below Tc and a line-node gap behavior at low temperatures.