Anisotropic superconducting properties of aligned MgB2 crystallites

O. F. de Lima; R. A. Ribeiro; M. A. Avila; C. A. Cardoso; A. A. Coelho

doi:10.1103/PhysRevLett.86.5974

Anisotropic superconducting properties of aligned MgB2 crystallites

Superconductivity 2009-11-07 v4 Materials Science

Authors: O. F. de Lima , R. A. Ribeiro , M. A. Avila , C. A. Cardoso , A. A. Coelho

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Abstract

Samples of aligned MgB2 crystallites have been prepared, allowing for the first time the direct identification of an upper critical field anisotropy Hc2^{ab}/Hc2^{c}= xi_{ab}/xi_{c} ~ 1.73; with xi_{o,ab} ~ 70 A, xi_{o,c} ~ 40 A, and a mass anisotropy ratio m_{ab}/m_{c} ~ 0.3. A ferromagnetic background signal was identified, possibly related to the raw materials purity.

Keywords

MgB2 anisotropic superconductivity upper critical field aligned crystallites mass anisotropy

Cite

@article{arxiv.cond-mat/0103287,
  title  = {Anisotropic superconducting properties of aligned MgB2 crystallites},
  author = {O. F. de Lima and R. A. Ribeiro and M. A. Avila and C. A. Cardoso and A. A. Coelho},
  journal= {arXiv preprint arXiv:cond-mat/0103287},
  year   = {2009}
}

Comments

4 pages, 4 figures; Revised version to appear in Phys. Rev. Lett

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