Anisotropic superconducting properties of MgB2 single crystals probed by in-plane electrical transport measurements
arXiv:cond-mat/0201451 · doi:10.1103/PhysRevB.65.140501
Abstract
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.
12 pages, 4 figures, to be published in PRB/Rapid