Enhanced flux pinning by combined atomic substitution and phase decomposition in cuprate superconductors
- 2 September 1991
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 59 (10) , 1239-1241
- https://doi.org/10.1063/1.105515
Abstract
The use of combined atomic substitution and phase decomposition is shown to achieve substantial enhancement of flux pinning in Y–Ba‐Cu–O ceramics. The substituent is chosen to provide a high density of nucleation sites for decomposition and at the same time enhancing Tc in the resulting composite superconductor. Bulk YBa2Cu4O8 (124) with 2.5% La substituted for Ba is decomposed by a short anneal beyond the stability boundary for YBa2Cu3O7 (123) at low oxygen pressure. The product, principally La‐substituted 123 with stacking faults and precipitates of CuO in the grain boundaries, exhibits a 17‐fold enhancement in intragrain Jc at 77 K and 0.75 Tesla over unprocessed 123, rising to 50‐fold at 85 K. Magnetization Jc exceeds 104 A/cm2 at 0.75 Tesla for temperatures up to 87 K, the highest so far observed for a superconductor.Keywords
This publication has 12 references indexed in Scilit:
- General trends in oxygen stoichiometry effects on Tc in Bi and Tl superconductorsPhysica C: Superconductivity and its Applications, 1991
- Ca- and La-substitution in YBa2Cu3O7−ξ, Y2Ba4Cu7O15−ξ and YBa2Cu4O8Physica C: Superconductivity and its Applications, 1991
- Critical currents after thermal neutron irradiation of uranium doped superconductorsJournal of Materials Research, 1991
- Zone melt texturing of YBa2Cu3O6+ with silver additionsPhysica C: Superconductivity and its Applications, 1990
- Bulk superconducting and prepared in oxygen at 1 atmPhysical Review B, 1990
- Enhanced flux pinning by phase decomposition in Y-Ba-Cu-OApplied Physics Letters, 1990
- Critical oxygen partial pressure for the “in-situ” preparation of high T c superconducting thin filmsPhysica C: Superconductivity and its Applications, 1989
- Critical currents near 106 A cm-2 at 77 K in neutron-irradiated single-crystal YBa2Cu3O7Nature, 1989
- Stability limits of the perovskite structure in the Y-Ba-Cu-O systemApplied Physics Letters, 1989
- Large magnetic hysteresis in a melt-textured Y-Ba-Cu-O superconductorApplied Physics Letters, 1989