Tc-oscillations of a superconducting heterostructure OC/V/Fe by oscillating couple in a fragment OC=Fe/Cr/Fe

TL;DR

This paper reports giant oscillations in the superconducting transition temperature (Tc) of an OC/V/Fe heterostructure, caused by varying Cr-layer thickness, likely due to oscillating exchange fields affecting superconductivity.

Contribution

It introduces the observation of Tc oscillations in OC/V/Fe heterostructures linked to Cr-thickness variations, exploring underlying mechanisms.

Findings

Giant Tc oscillations depend on Cr-thickness.

Oscillations attributed to exchange field cancellations.

Superconducting transition temperature varies periodically with Cr-layer thickness.

Abstract

Superconducting transition temperature (Tc) and FMR were measured in heterostructure OC/V/Fe, were OC=Fe/Cr/Fe. Giant oscillations of Tc depending on a Cr-thickness were detected. Probable reasons of Tc-oscillation are discussed - periodic cancellation of pair-breacking exchange fields in superconducting V-layer or in fragment Fe/Cr/Fe.