Point-contact tunneling involving low-dimensional spin-triplet superconductors

TL;DR

This paper extends microscopic tunneling calculations to spin-triplet superconductors, revealing distinctive I-V features that help identify pairing types, especially under magnetic fields, with relevance to organic and layered superconductors.

Contribution

It introduces a modified Green function formalism for spin-triplet pairing in tunneling, enabling identification of pairing symmetry through I-V characteristics under magnetic fields.

Findings

Distinctive I-V features for spin-triplet pairing

Magnetic field effects help distinguish pairing types

Relevance to organic and layered superconductors

Abstract

We modify and extend previous microscopic calculations of tunneling in superconducting junctions based on a non-equilibrium Green function formalism to include the case of spin-triplet pairing. We show that distinctive features are present in the I-V characteristics of different kinds of junctions, in particular when the effects of magnetic fields are taken into account, that permit to identify the type of pairing. We discuss the relevance of these results in the context of quasi one-dimensional organic superconductors like (TMTSF)_2(PF_6) and layered compounds like Sr_2RuO_4.