Tunneling conductance of normal metal/insulator/Sr2RuO4 junction

TL;DR

This paper presents a theoretical study of tunneling conductance spectra in normal metal/insulator/Sr2RuO4 junctions, exploring how different triplet pairing symmetries affect observable conductance features and emphasizing the need for ultra-low temperature measurements.

Contribution

It introduces a theoretical framework for analyzing tunneling spectra in Sr2RuO4 with various triplet pairing symmetries, aiding experimental identification of the pairing state.

Findings

Zero bias peaks or gap-like structures depend on junction orientation.

Residual gap components indicate non-unitary superconducting states.

Measurement below 100mK is necessary to determine pairing symmetry.

Abstract

A theory of tunneling conductance spectra for normal metal/insulator/Sr$_{2}$RuO$_{4}$ junction is studied theoretically. We assume several types of pair potentials with triplet symmetries that are promising candidates for Sr$_{2}$RuO$_{4}$. The calculated conductance spectra show either zero bias peaks or gap like structures depending on the orientations of the junctions. The existence of a residual components in the gap reflects a non-unitary property of the superconducting states. Based on the calculation of a temperature dependence, we will verify that the measurement temperature below 100mK is required to determine the pairing symmetry experimentally.