Paramagnetic effect at low and high magnetic fields in melt-textured YBa/sub 2/Cu/sub 3/O/sub 7-[delta]/
dc.contributor.author | Dias, Fabio Teixeira | pt_BR |
dc.contributor.author | Pureur Neto, Paulo | pt_BR |
dc.contributor.author | Rodrigues Junior, Pedro | pt_BR |
dc.contributor.author | Obradors, Xavier | pt_BR |
dc.date.accessioned | 2014-10-09T02:13:07Z | pt_BR |
dc.date.issued | 2004 | pt_BR |
dc.identifier.issn | 1098-0121 | pt_BR |
dc.identifier.uri | http://hdl.handle.net/10183/104298 | pt_BR |
dc.description.abstract | We report on systematic field-cooled magnetization experiments in five different melt-textured YBa2Cu3O7 samples containing large amounts of Y2BaCuO5 precipitates. These composites were grown with the Bridgman or top-seeding techniques. Fields ranging from 1 Oe up to 50 kOe were applied either parallel or perpendicular to the Cu-O2 atomic planes. In the low field limit, we observed the paramagnetic Meissner effect (PME) in a Bridgman grown sample for the configuration where the field is oriented parallel to the Cu-O2 atomic planes. Contrasting with this unique observation at low fields, a paramagnetic response related to the superconducting state was observed in all of the studied samples when strong enough fields were applied in both orientations. This high-field paramagnetic effect shows some noticeable differences when compared to the most frequently reported PME at very low fields. In particular, the magnitude of the high-field paramagnetic moment increases when the field is augmented. Moreover, this effect shows a strong and anomalous relaxation, such that the paramagnetic moment increases as a function of the time. The anisotropy of the high-field paramagnetic moment depends on the sample microstructure, suggesting that pinning by the Y2BaCuO5 particles plays a crucial role in the explanation of this effect in the melt-processed YBa2Cu3O7 materials. | en |
dc.format.mimetype | application/pdf | |
dc.language.iso | eng | pt_BR |
dc.relation.ispartof | Physical review. B, Condensed matter and materials physics. Woodbury. Vol. 70, no. 22 (Dec. 2004), 224519 9p. | pt_BR |
dc.rights | Open Access | en |
dc.subject | Física | pt_BR |
dc.title | Paramagnetic effect at low and high magnetic fields in melt-textured YBa/sub 2/Cu/sub 3/O/sub 7-[delta]/ | pt_BR |
dc.type | Artigo de periódico | pt_BR |
dc.identifier.nrb | 000513242 | pt_BR |
dc.type.origin | Estrangeiro | pt_BR |
Este item está licenciado na Creative Commons License
-
Artigos de Periódicos (39774)Ciências Exatas e da Terra (6068)