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

Article

关键词: UPPER CRITICAL-FIELD;    CRITICAL CURRENTS;    PHASE-DIAGRAM;   

DOI  :  10.1103/PhysRevB.65.140501

来源: SCIE

【 摘 要 】

We report on the study of the electronic anisotropy of the MgB2 superconductor using the in-plane resistivity measurements in the magnetic field applied perpendicular and parallel to Mg and B planes of MgB2 single crystals. The results show the temperature dependent anisotropy of the upper critical field with the anisotropy ratio gamma=H-c2parallel to/H-c2perpendicular to increasing from 2.2 close to T-c up to about 3 below 30 K. Our estimation of the in-plane and out-of-plane coherence length of about xi(ab)(0)=68 Angstrom and xi(c)(0)=23 Angstrom and the electronic mean-free path l(ab)=240 Angstrom and l(c)=60 Angstrom, respectively, indicates MgB2 single crystal approaches the clean limit type-II superconductor.

【 授权许可】

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