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Paramagnetic effect at low and high magnetic fields in melt-textured YBa/sub 2/Cu/sub 3/O/sub 7-[delta]/

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Paramagnetic effect at low and high magnetic fields in melt-textured YBa/sub 2/Cu/sub 3/O/sub 7-[delta]/

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Título Paramagnetic effect at low and high magnetic fields in melt-textured YBa/sub 2/Cu/sub 3/O/sub 7-[delta]/
Autor Dias, Fabio Teixeira
Pureur Neto, Paulo
Rodrigues Junior, Pedro
Obradors, Xavier
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.
Contido em Physical review. B, Condensed matter and materials physics. Woodbury. Vol. 70, no. 22 (Dec. 2004), 224519 9p.
Assunto Física
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/104298
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