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High-field paramagnetic Meissner effect up to 14 T in melt-textured YBa 2 Cu 3 O 7 –δ

AutorDias, Fábio Teixeira; Obradors, Xavier ; Puig Molina, Teresa ; Sahoo, B.K.
Palabras claveParamagnetic Meissner effect
Vortex pinning
Magnetic relaxation
Magnetic flux compression
Fecha de publicaciónjun-2016
EditorElsevier
CitaciónPhysica - Section C 525-526: 105-110 (2016)
ResumenWe have performed magnetization experiments in a melt-textured YBa 2 Cu 3 O 7- δ(Y123) sample with Y 2 BaCuO 5 (Y211) inclusions, under magnetic fields up to 14 T applied parallel or perpendicular to the ab plane. Magnetic anisotropy and paramagnetic moments were observed in both FC (field-cooling) and FCW (field-cooled warming) procedures and these features correspond to the so-called High-Field Para- magnetic Meissner Effect (HFPME). The HFPME effect increases monotonically as the magnetic field rises and a strong paramagnetic relaxation, toward increasing paramagnetic moment was additionally observed as a function of time. Microscopy analysis revealed a complex and correlated microstructure of the Y211 particles. These correlated defects are well known to cause strong flux pinning. Our results suggest a sce- nario of strong flux compression within weak or non-superconducting regions of the samples, developed as a consequence of the Meissner effect and assisted by strong flux pinning by the Y211 particles. This scenario is observed up to 14 T and clearly persists beyond.
DescripciónDias, Fábio Teixeira et al.
Versión del editorhttp://dx.doi.org/10.1016/j.physc.2016.03.013
URIhttp://hdl.handle.net/10261/152691
DOI10.1016/j.physc.2016.03.013
ISSN0921-4534
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