Anisotropy of the magnetization of single crystals and bulk high-Tc superconductors

U. Yaron, I. Felner, Y. Kornyushin, Y. Yeshurun

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Abstract

Measurements of the angular dependence of the zero-field-cooled (ZFC), field-cooled (FC) and remanent magnetization of both high-Tc single crystals and polycrystalline samples show significant anisotropy. Comparison of the results obtained on both, prove that most anisotropy is governed by the shape of the sample via the demagnetizing factors. For ceramic samples, there is competition between the demagnetizing factors of the sample as a whole, N, and that of the grains, n. According to a suggested phenomenological model, the magnetic moment is related to the external field by a relation involving an effective demagnetizing factor, Neff, which depends on the fraction of superconducting volume, which is itself a field dependent quantity. At low fields, Neff approaches N and n for highly compact and dilute samples, respectively. Between these extremes, Neff is a weighted average of N and n.

Original languageEnglish
Pages (from-to)159-162
Number of pages4
JournalPhysica C: Superconductivity and its Applications
Volume209
Issue number1-3
DOIs
StatePublished - 20 Apr 1993

Bibliographical note

Funding Information:
This research was supported by a grant from the 1Vhmstry of Science and Technology, Jerusalem, Israel, by the Klachky Foundation for Superconductivity and by a grant from the U.S.-Israel Binational Science Foundation (BSF), Jerusalem, Israel.

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