Transport critical current of aligned polycrystalline Y1Ba2Cu3O7−δand evidence for a nonweak‐linked component of intergranular current conduction

Autor:	A. R. Gaddipati, H. R. Hart, John (Jack) W. Ekin
Rok vydání:	1990
Předmět:	Superconductivity Materials science High-temperature superconductivity Condensed matter physics General Physics and Astronomy Mineralogy law.invention Magnetic field law Electrical resistivity and conductivity Grain boundary Electric current Current density Critical field
Zdroj:	Journal of Applied Physics. 68:2285-2295
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.346533
Popis:	A study of grain alignment and its effect on the dc transport critical current in fine‐grained bulk Y1Ba2Cu3O7−δ is reported in magnetic fields from 10−4 T to 26 T. Two features distinguish the critical current density Jc of aligned bulk Y1Ba2Cu3O7−δ from unaligned material. First, the effective critical field where the intergranular Jc approaches zero is about four times higher (30 T) for aligned samples with field parallel to the a, b planes, than it is for polycrystalline unaligned samples (7 T). Second, the nearly field independent plateau value of Jc between 10 mT and 1 T is one to two orders of magnitude higher than typical plateau values of Jc in unaligned bulk‐sintered Y1Ba2Cu3O7−δ, for field parallel to the a, b planes. A low‐field (
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::7f337972d917ca981c161d0ada26fe02 https://doi.org/10.1063/1.346533 Zobrazit plný text záznamu