Anomalous features of the proximity effect in triplet superconductors

TL;DR

This paper investigates unique features of the proximity effect in diffusive normal metal/triplet superconductor junctions, revealing anomalous energy dependence of pair amplitude and its implications for local density of states and magnetic field penetration.

Contribution

It introduces an anomalous relation for the pair amplitude in DN/TS junctions and explores its consequences, which differ from singlet superconductor cases.

Findings

Zero energy peak in local density of states

Anomalous magnetic field penetration into DN

Distinct energy dependence of pair amplitude

Abstract

Anomalous features of the proximity effect specific to diffusive normal metal / triplet superconductor (DN/TS) junctions are studied within the quasiclassical Green's function formalism. The pair amplitude $f_{N}$ as a function of energy $\epsilon$ in DN, satisfies an anomalous relation, $% f_{N}(\epsilon)=-f^{*}_{N}(-\epsilon)$, contrary to that in singlet superconductor junctions case where $f_{N}(\epsilon)=f^{*}_{N}(-% \epsilon)$. Such an unusual $\epsilon$ dependence is responsible for a zero energy peak in the local density of states and is a source of an anomalous penetration of the applied magnetic field into DN. % Our results are relevant to Sr$_{2}$RuO$_{4}$, which is considered to have a $p_{x}+ip_{y}$-wave symmetry.