Conveners
M3Or3J: Latest Development in Flux Pinning & Critical Current - non-REBCO
- Eric Hellstrom (ASC/Florida State University)
- Leonardo Civale (Los Alamos National Laboratory)
APC Nb3Sn wires have been made which incorporate non-superconducting nanometer-scale inclusions in the form of ZrO2 or HfO2. In addition to strengthening the surface-type flux pinning by refining the grain size, the nanoparticles introduce a point-type pinning mechanism, the efficacy of which peaks at higher magnetic field than the grain boundary pinning....
In the past few years a new type of Nb3Sn strand with artificial pinning centers (APC) has demonstrated significantly superior performance relative to the state-of-the-art Nb3Sn conductors. Such APC strands are based on the internal oxidation method, which generates nano-size ZrO2 or HfO2 particles (mostly 1-10 nm) in Nb3Sn. It was found that this method improves high-field Jc via four...
Critical current density $J_c$ properties of 7 core Cu/Ag/(Ba, K)Fe$_2$As$_2$ (Cu/Ag/Ba122) tapes are investigated in low temperature and high magnetic field. The tape was fabricated by a powder-in-tube method with a flat-roll process [1]. The hysteresis behavior in magnetic field and its angular dependences of $J_c$ were observed at 4.2 K and low field. The $J_c$ values in increasing filed...
Cuprate and iron-based superconductor cables offer powerful opportunities for increasing capacity, reliability, and efficiency of the electricity grid. Superconducting coils can provide an alternative to rare-earth permanent magnets used in rotary machines and generators. In this presentation, I will provide an overview of recent studies on the enhanced critical current density in cuprate and...
Ion irradiation is a well-established technique to create a variety of structural defects, such as points, clusters and tracks in superconducting materials without the problem of sample-to-sample variation. Recently, ion irradiation in a low energy range (< several MeV) has received a renewed interest as a practical method for improving critical current density Jc in magnetic...
The electronic transport and optical properties of high quality multilayers of NbTiN/AlN with ultrathin NbTiN layers were characterized. The anisotropy of the dielectric function of the multilayers confirmed their hyperbolic metamaterial properties. The superconductive transition temperature, Tc, of these engineered superconductors was enhanced up to 32% compared to the Tc of a single...
