Penetration Depth Measurements in MgB2: Evidence for Unconventional Superconductivity
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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