Exponential Temperature Dependence of Penetration Depth in Single Crystal MgB2
F. Manzano, A. Carrington, N. E. Hussey, S. Lee, A. Yamamoto
Abstract
The temperature dependence of the London penetration depth,lambda(T), was measured in both single crystal and polycrystalline MgB2 samples by a high-resolution, radio frequency technique. A clear exponential temperature dependence of lambda(T) was observed at low temperature, indicating s-wave pairing. A BCS fit to the lowest temperature data gives an in-plane energy gap Delta of 2.60.2 meV (2Δ/Tc=1.50.1), which is significantly smaller than the standard BCS weak coupling value of 3.5. We find that the data are best described by a two-gap model.
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