Magnetic Properties and Critical Current of Superconducting Nanocomposites (1 −x)YBa2Cu3O7−δ + xCuO

Abstract

The aim of this paper was to study the effect of nanoscale inclusions of CuO as the second ingredient of composites on transport properties of superconducting YBa 2 Cu 3 O 7 polycrystals. The samples of YBa 2 Cu 3 O 7−δ with different content of CuO nanoparticles were synthesized. The analysis of the magnetic properties was carried out within the extended critical state model. It was found that the addition of 0.5 and 1% of CuO nanoparticles leads to an increase in the intragranular density of the critical current at T = 4.2 K. A further increase of x from 2 to 15% and more than 40% decreases the critical current density. The critical current density higher than in the reference sample was also found in the samples with x = 20% and x = 24%.

Investigation of the Quenching Rate Effect on the Ferromagnetic Properties of CuO Nanoparticles

“…The shell is formed as a result of high-speed deposition of CuO clusters from the plasma phase onto the surface of the "core" of the nanoparticle. As a result, a dendritic structure with a high specific surface [21] is formed. The specific surface of sample 2, measured by the BET method, was 130 m 2 /g.…”

Dominant factors for the pinning enhancement by large artificial partial and complete antidots in superconducting films

“…Tailored flux pinning in YBa 2 Cu 3 O 7 (YBCO) using artificial and natural defects can provide the necessary J c enhancements. Major studies in film microstructure alterations such as multilayering [1,2], addition of secondary phase nanocomposites [3][4][5][6], nanorods [7][8][9] or ion irradiation [10][11][12] have proved successful.…”

The Circulation Radius and Critical Current Density in Type II Superconductors

“…In single crystals of high-temperature superconductors (HTSCs), critical current density Jc can reach up to ~10 12 A/m 2 , which is close to the values of depairing current density [2,3]. Due to these high values, J c is usually determined by indirect methods based on magnetic measurements, rather than by direct charge transport measurement techniques.…”

“…In the present work, formula (5) has been verified for polycrystalline HTSCs. Figure 1 shows the fragments of magnetization curves of polycrystalline YBa 2 Cu 3 O 7-δ (YBCO) [12] and Bi 1.8 Pb 0.3 Sr 1.9 Ca 2 Cu 3 O x (BSCCO) [13] superconductors measured at 4.2 K. The loops are asymmetric relative to the axis of field H, the asymmetry being more pronounced for YBCO. corresponding to massive single-crystalline samples in low magnetic fields can be estimated as J cb ≈ 9.7 × 10 10 A/m 2 for YBCO and J cb ≈ 10 × 10 10 A/m 2 for BSCCO.…”