Observation of magnetic fields due to persistent currents in a ring made of a Y₁Ba₂Cu₃O_7-δcoated conductor

Abstract

A ring comprising a coated conductor was fabricated. First, the two ends of a biaxially textured Ni tape were connected by means of the atomic diffusion bonding technique. Then buffer layers and a YBCO film were deposited on the ring. All the films were well textured as confirmed by XRD pole figures. The B-H loops, where B and H are the magnetic field at the centre of the ring and the applied field, respectively, were measured as a function of temperature. The persistent current density (J c ) flowing circularly was estimated from the remanent field of B. In the range of temperatures from 72 to 20 K, J c changed from 0 to 2 × 10 5 A cm −2 .

Tensile stress effects on critical current densities of coated conductors

“…The texture qualities as confirmed by XRD pole figures for the YBCO film and the buffer layers on the pure Ni tape were very similar to those already published [12] and will not be described again here.…”

Crossover phenomena observed in field dependent critical currents at grain boundaries of Nd1Ba2Cu3O7 films

“…We prepared four Nd 1 Ba 2 Cu 3 O 7 (NdBCO) films grown on bicrystalline SrTiO 3 (STO) substrates of 24 • , 30 • , 36.8 • , and 45 • symmetric misorientation angles using the co-evaporation method, which was described elsewhere [9]. The thickness of NdBCO films was about 100 nm.…”