Exponential Temperature Dependence of Penetration Depth in MgB₂
Manzano, F. · Carrington, A.
Original · EN
The temperature dependence of the London penetration depth, λ(T), was measured in polycrystalline MgB₂ samples by a high-resolution, radio frequency technique. A clear exponential temperature dependence of λ(T) was observed at low temperature, indicating s-wave pairing. A fit to the data gives an effective energy gap Δ of 2.8±0.4 meV (2Δ/kBTc=1.7±0.2), which is significantly smaller than the standard BCS weak coupling value of 3.5. This may be explained either by an anisotropic gap or the influence of low frequency phonon modes.
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