Anisotropic superconducting properties of aligned MgB2 crystallites

Details Anisotropic superconducting properties of aligned MgB2 crystallites Anisotropic superconducting properties of aligned MgB2 crystallites

2001-03-13

arxiv.org/abs/cond-mat/0103287v4

published in Phys. Rev. Lett. 86, 5974 (2001).

Physics

Condensed Matter

Superconductivity

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

Scientific paper

10.1103/PhysRevLett.86.5974

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.

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