Anti-Meissner effect and low field magnetic relaxation in sintered Bi-2212

https://doi.org/10.1016/0921-4526(94)91274-2Get rights and content

Abstract

A detailed study of the low field magnetic properties of some sintered Bi-2212 samples has been performed. For sufficiently low applied magnetic fields, typically for fields H < 0.2 Oe, the field-cooled magnetisation becomes positive at some temperature below Tc (anti-Meissner effect), contrary to the usual Meissner effect. The field dependence of this effect is comparable to the predicted behaviour for a system in an orbital glass state. Additionally, the relaxation of the zero-field-cooled magnetisation displays an unexpected field dependence, the relaxation rate S = ∂M/ log(t) increases as Hα with α ≈ 0.9 at very low fields. In contrast to the behaviour found in sintered YBCO, this result is not accounted for in conventional flux creep models, where the prediction is α ≥ 2.

References (7)

  • P. Svedlindh et al.

    Physica C

    (1989)
  • D. Shi et al.

    Phys. Rev. B

    (1990)
  • W. Braunisch et al.

    Phys. Rev. Lett.

    (1992)
    W. Braunisch, N. Knauf, G. Bauer, A. Kock, A. Becker, B. Freitag, A. Grütz, V. Kataev, S. Neuhausen, B. Roden, D....
There are more references available in the full text version of this article.

Cited by (16)

  • ac susceptibility of a paramagnetic Meissner effect sample

    1998, Physica C: Superconductivity and its Applications
View all citing articles on Scopus
View full text