Artificially engineered superlattices of pnictide superconductor

Abstract

Significant progress has been achieved in fabricating high quality bulk and thinfilm iron-based superconductors. In particular, artificial layered pnictide superlattices offer the possibility of tailoring the superconducting properties and understanding the mechanism of the superconductivity itself. For high field applications, large critical current densities (Jc) and irreversibility fields (Hirr) are indispensable along all crystal directions. On the other hand, the development of superconducting devices such as tunnel junctions requires multilayered heterostructures. Here we show that artificially engineered undoped Ba-122 / Co doped Ba-122 compositionally modulated superlattices produce ab-aligned nanoparticle arrays. These layer and self-assemble along c-axis aligned defects, and combine to produce very large Jc and Hirr enhancements over a wide angular range. We also demonstrate a structurally modulated SrTiO3 (STO) / Co doped Ba-122 superlattice with sharp interfaces. Success in superlattice fabrication involving pnictides will aid the progress of heterostructured systems exhibiting novel interfacial phenomena and device applications.

13 pages, 5 figures & supplementary information

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• Fe-based superconducting thin films on metallic substrates: growth, characteristics and relevant properties
• High critical-current density with less anisotropy in BaFe2(As,P)2 epitaxial thin films: Effect of intentionally grown c-axis vortex-pinning centers
• Development of very high Jc in Ba(Fe1-xCox)2As2 thin films grown on CaF2
• The role of double TiO2 layers at the interface of FeSe/SrTiO3 superconductors
• Oxypnictide SmFeAs(O,F) superconductor: a candidate for high-field magnet applications
• Enhancement of critical current density and mechanism of vortex pinning in H${}^{+}$-irradiated FeSe single crystal
• Enhanced critical-current in P-doped BaFe2As2 thin films on metal substrates arising from poorly aligned grain boundaries
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• Imaging pinning and expulsion of individual superconducting vortices in amorphous MoSi thin films
• Ambipolar suppression of superconductivity by ionic gating in optimally-doped BaFe2(As,P)2 ultrathin films
• Status of Iron Based Superconductors: characteristics and relevant properties for applications
• Electrodynamics of superconducting pnictide superlattices
• Tunable superconductivity in Fe-pnictide heterointerfaces by diffusion control
• Enhancement of the critical current by surface irregularities in Fe-based superconductors
• A scenario for the critical fluctuations near the transition of few-bilayer films of high-temperature cuprate superconductors
• Artificially Engineered Nanostrain in Iron Chalcogenide Superconductor Thin Film for Enhancing Supercurrent