Anisotropic Superconducting Properties of MgB2 Single Crystals

Details Anisotropic Superconducting Properties of MgB2 Single Crystals Anisotropic Superconducting Properties of MgB2 Single Crystals

2002-02-08

arxiv.org/abs/cond-mat/0202133v1

Physica C, v.378-381, 61(2002)

Physics

Condensed Matter

Superconductivity

10pages, including 5 figures,submitted to Physica C (in press)

Scientific paper

10.1016/S0921-4534(02)01383-7

In-plane electrical transport properties of MgB2 single crystals grown under high pressure of 4-6 GPa and temperature of 1400-1700oC in Mg-B-N system have been measured. For all specimens we found sharp superconducting transition around 38.1-38.3K with transition width within 0.2-0.3K. Estimated resistivity value at 40K is about 1 mkOhmcm and resistivity ratio R(273K)/R(40K) of about 4.9. Results of measurements in magnetic field up to 5.5T perpendicular to Mg and B planes and up to 9T in parallel orientation 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. Strong deviation of the angular dependence of Hc2 from anisotropic mass model has been also found.

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