High-field paramagnetic Meissner effect up to 14 T in melt-textured YBa2Cu3O7-delta
Tipus de documentArticle
Condicions d'accésAccés obert
Projecte de la Comissió EuropeaEUROMAGNET II - A coordinated approach to access, experimental development and scientific exploitation of all European large infrastructures for high magnetic fields (EC-FP7-228043)
We have performed magnetization experiments in a melt-textured YBa2Cu3O7-delta(Y123) sample with Y2BaCuO5 (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 Paramagnetic 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 scenario 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. (C) 2016 Elsevier B.V. All rights reserved.
CitacióTeixeira, T., Vieira, V.N., Wolff-Fabris, F., Kampert, E., Gouvêa, C.P., Campos, A.P.C., Archanjo, B.S., Schaf, J., Obradors, X., Puig, T., Roa, J.J., Sahoo, B.K. High-field paramagnetic Meissner effect up to 14 T in melt-textured YBa2Cu3O7-delta. "Physica C. Superconductivity and its applications", 1 Juny 2016, vol. 525-526, p. 105-110.
Versió de l'editorhttp://www.sciencedirect.com/science/article/pii/S0921453416300107