Abstract
We have investigated the magnetic and transport properties of MgB 2 superconductor over wide temperature and magnetic ranges. The upper critical fields H c2 are determined by the scaling analysis of the thermal fluctuation magnetoconductivity. Around the transition region, the thermal fluctuation magnetoconductivity can be scaled by a universal function for all applied magnetic fields. The formula H c2( T)= H c2(0)[1−( T/ T c) 3/2] 3/2 of a narrow-band pairing mechanism gives an excellent fit to the data. Based on the value of upper critical field H c2 (0)=155 kOe, the superconducting coherence length is determined to be 4.6 nm. The Ginzburg–Landau parameter κ is 50 in the MgB 2 superconducting system.
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