Vortex Structures in Model p-Wave Superconducting Sr2RuO4 -- Single 2-Dimensional Band v.s. Quasi-1-Dimensional Band

TL;DR

This study compares vortex structures in single 2D and quasi-1D band models of Sr2RuO4 superconductivity, revealing distinct local density of states patterns and relaxation rates that can help identify the primary superconducting band.

Contribution

It provides a comparative analysis of vortex structures in different band models of Sr2RuO4 using Bogoliubov-de Gennes theory, highlighting observable differences.

Findings

Diamond-shaped iso-value patterns in quasi-1D model

Isotropic vortex core structure in 2D model

Enhanced spin lattice relaxation rate in 2D vortex state

Abstract

There have been an interesting debate on the primary source of chiral p-wave superconductivity in Sr2RuO4. We present a comparative study on the vortex structure between a single 2-dimensional (2D) band and quasi-1D band model by using Bogoliubov-de Gennes theory. The pattern of the iso-values of the local density of state around a vortex has a diamond shape in the quasi-1D model and is much more isotropic in the 2D model. The spin lattice relaxation rate well below the superconducting transition temperature is greatly enhanced in the vortex state in the 2D model but not in the quasi-1D model. These features can be tested by using scanning tunneling microscope and NMR to distinguish the models for the superconductivity in Sr2RuO4.