Normal metal to ferromagnetic superconductor tunneling

TL;DR

This paper investigates tunneling between a normal metal and a ferromagnetic superconductor, demonstrating how tunneling conductance reveals the pairing mechanism and allows extraction of magnetization and superconducting order parameters.

Contribution

It provides a theoretical analysis of tunneling conductance for magnon- and paramagnon-induced superconductivity, proposing tunneling experiments to identify the pairing mechanism.

Findings

Tunneling conductance is smooth and continuous for magnon-induced pairing.

Tunneling conductance can be used to determine magnetization and superconducting order parameter.

Tunneling behavior differs significantly between magnon- and paramagnon-induced superconductivity.

Abstract

We study the point-contact tunneling between normal metal and ferromagnetic superconductor. In the case of magnon-induced pairing the tunneling conductance is continuous and smooth function of the applied voltage. For small values of the applied voltage the Ohm law holds. We show that one can obtain the magnetization and the superconducting order parameter from the tunneling conduc- tance. In the case of paramagnon-induced superconductivity the tunneling does not depend on the magnetization. We argue that tunneling experiment can unambiguously determine the correct pairing mechanism in the ferromagnetic superconductors.