Penetration Depth Measurements in MgB2: Evidence for Unconventional Superconductivity
C. Panagopoulos, B. D. Rainford, T. Xiang, C. A. Scott, M. Kambara, I. H. Inoue
Abstract
We have measured the magnetic penetration depth of the recently discovered binary superconductor MgB2 using muon spin rotation and low field ac-susceptibility. From the damping of the muon precession signal we find the penetration depth at zero temperature is about 85nm. The low temperature penetration depth shows a quadratic temperature dependence, indicating the presence of nodes in the superconducting energy gap.
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