Theory of tunneling spectroscopy in superconducting Sr2RuO4

TL;DR

This paper develops a theoretical model for tunneling spectroscopy in Sr2RuO4, revealing conductance features like zero-bias peaks that indicate non-unitary triplet superconducting states.

Contribution

It introduces a novel theoretical framework for understanding tunneling spectra in Sr2RuO4, focusing on non-unitary triplet pairing states.

Findings

Zero-bias conductance peaks observed in spectra

Residual spectral components indicate non-unitary pairing

Theoretical spectra match experimental features

Abstract

A theory for tunneling spectroscopy in normal metal /insulator/triplet superconductor junction is presented. We assume two kinds of non-unitary triplet superconducting states which are the most promising states for Sr$_{2}$RuO$_{4}$. The calculated conductance spectra showzero-bias peaks as well as gap structures. The existences of residual components in the spectra reflect the non-unitary properties of superconducting states.