Anisotropic superconducting properties of MgB2 single crystals probed by in-plane electrical transport measurements

Details Anisotropic superconducting properties of MgB2 single crystals probed by in-plane electrical transport measurements Anisotropic superconducting properties of MgB2 single crystals probed by in-plane electrical transport measurements

2002-01-25

arxiv.org/abs/cond-mat/0201451v2

Phys. Rev B65, 140501(R), 2002

Physics

Condensed Matter

Superconductivity

12 pages, 4 figures, to be published in PRB/Rapid

Scientific paper

10.1103/PhysRevB.65.140501

We report on study of the electronic anisotropy of the newly discovered MgB2 superconductor using the in-plane resistivity measurements in magnetic field applied perpendicular and parallel to Mg and B planes of MgB2 single crystals. The results show temperature dependent anisotropy of the upper critical field with anisotropy ratio increasing from 2.2 close to Tc up to about 3 below 30K. Our estimation of the in-plane and out-of-plane coherence length of about 68A and 23A and electronic mean-free path 240A and 60A respectively indicates MgB2 single crystal as approaching clean limit type-II superconductor.

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