Biaxially textured cobalt-doped BaFe2As2 films with high critical current density over 1 MA/cm2 on MgO-buffered metal-tape flexible substrates

TL;DR

This paper reports the achievement of high critical current densities exceeding 1 MA/cm2 in cobalt-doped BaFe2As2 films on flexible metal substrates, demonstrating potential for superconducting tape applications.

Contribution

It introduces a method to produce biaxially textured BaFe2As2:Co films with high Jc on flexible MgO-buffered substrates, surpassing previous iron pnictide superconductor performance.

Findings

Jc > 1 MA/cm2 at 2 K on flexible substrates

High in-field Jc indicates effective vortex pinning

Crystalline misorientation remains low despite substrate misalignment

Abstract

High critical current densities (Jc) > 1 MA/cm2 were realized in cobalt-doped BaFe2As2 (BaFe2As2:Co) films on flexible metal substrates with biaxially-textured MgO base-layers fabricated by an ion-beam assisted deposition technique. The BaFe2As2:Co films showed small in-plane crystalline misorientations (delta fai BaFe2As2:Co) of ~3o regardless of doubly larger misorientaions of the MgO base-layers (delta fai MgO = 7.3o), and exhibited high self-field Jc up to 3.5 MA/cm2 at 2 K. These values are comparable to that on MgO single crystals and the highest Jc among iron pnictide superconducting tapes and wires ever reported. High in-field Jc suggests the existence of c-axis correlated vortex pinning centers.