Critical current density in superconducting niobium films

UHV Arc Deposition of Superconducting Niobium Films

Recently the UHV arc technology was proposed as a possible alternative for depositing thin superconducting films of pure niobium on the inside surface of RF cavities for particle accelerators. The paper describes status of research on deposition of superconducting films for RF accelerating cavities. New UHV arc based devices with planar and cylindrical niobium cathodes are presented. The main r...

1 Suppression of Superconducting Critical Current Density by Small Flux Jumps in MgB 2 Thin Films

By doing magnetization measurements during magnetic field sweeps on thin films of the new superconductor MgB2, it is found that in a low temperature and low field region small flux jumps are taking place. This effect strongly suppresses the central magnetization peak leading to reduced nominal superconducting critical current density at low temperatures. A borderline for this effect to occur is...

Reversible and irreversible effects of strain on the critical current density of a niobium–tin superconducting wire

Systematic measurements have been made of the engineering critical current density (Je) and N-value (where E 1⁄4 aJN ) of a jellyroll Nb3Sn wire as a function of magnetic field and strain at 4.2 K. Strain cycling to very high tensile strains at 4.2 K was used to investigate the reversibility of the wire’s properties. The Je data were fully reversible up to 0.67% strain, and can be approximately...

EFFECT OF A COMPRESSIVE UNIAXIAL STRAIN ON THE CRITICAL CURRENT DENSITY OF GRAIN BOUNDARIES IN SUPERCONDUCTING YBa2Cu3O7-δ FILMS (POSTPRINT)

High Critical Current Density of YBa2Cu3O7−x Superconducting Films Prepared through a DUV-assisted Solution Deposition Process

Although the solution deposition of YBa2Cu3O7-x (YBCO) superconducting films is cost effective and capable of large-scale production, further improvements in their superconductivity are necessary. In this study, a deep UV (DUV) irradiation technique combined with a low-fluorine solution process was developed to prepare YBCO films. An acrylic acidic group as the chelating agent was used in the p...