Andreev Reflection Spectroscopy in Transition Metal Oxides

TL;DR

This paper reviews Andreev reflection spectroscopy in superconductor-ferromagnet junctions, focusing on transition metal oxides, discussing model applicability, and evidence for Andreev bound states.

Contribution

It provides a comprehensive review of measurement techniques and theoretical models for Andreev reflection in transition metal oxide ferromagnets, highlighting current challenges and evidence for bound states.

Findings

Current models have limitations in transition metal oxides

Evidence suggests presence of Andreev bound states

Assessment of spin polarization measurement methods

Abstract

Here we review the literature concerning measurement of the Andreev reflection between a superconductor (S) and ferromagnet (F), with particular attention to the case where the ferromagnet is a transition metal oxide. We discuss the practicality of utilisation of the current models for determination of the transport current spin polarisation and examine the evidence for Andreev bound states.