Anisotropic Superconducting Properties of Aligned MgB2 Crystallites

2001/03/31 by Otavio de Oliveira Lima, O. F. de Lima, R. A. Ribeiro +5 · 1 citation
Materials Science · Physics and Astronomy · #Iron-based superconductors research #Physics of Superconductivity and Magnetism #Superconductivity in MgB2 and Alloys #cond-mat.mtrl-sci #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevlett.86.5974

published as published in Phys. Rev. Lett. 86, 5974 (2001). · 4 pages, 4 figures; Revised version to appear in Phys. Rev. Lett

arxiv created 2001/05/15 · openalex publication_date 2001/06/01 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/31

Abstract

Samples of aligned MgB₂ crystallites have been prepared, allowing for the first time the direct identification of an upper critical field anisotropy H_c2^ab/H_c2^c\phantom\rule0ex0ex=\phantom\rule0ex0ex\ensuremathξ_ab/\ensuremathξ_c\ensuremath≃1.7, with \ensuremathξ_o,ab\ensuremath≃70\AA, \ensuremathξ_o,c\ensuremath≃40\AA, and a mass anisotropy ratio m_ab/m_c\ensuremath≃0.3. A ferromagnetic background signal was identified, possibly related to the raw materials purity.

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