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VOLUME 76 (2002) | ISSUE 1 | PAGE 20
Fluctuation conductivity in superconducting MgB2
PACS: 74.62.Bf, 74.70.Ad, 74.76.-w
Abstract
According to the crystal structure of MgB2 and band structure calculations quasi-two-dimensional (2D) boron planes are responsible for the superconductivity. We report on critical field and resistance measurements of 5.6 μm thick MgB2 films grown on a sapphire single crystalline substrate. Resistivity measurements yield a temperature dependence of the fluctuation conductivity above the critical temperature which agrees with the Aslamazov-Larkin and Maki-Thompson theory of fluctuations in layered superconductors, indicating a quasi-two-dimensional nucleation of superconductivity in MgB2.