Exponential Temperature Dependence of Penetration Depth in MgB_2

Details Exponential Temperature Dependence of Penetration Depth in MgB_2 Exponential Temperature Dependence of Penetration Depth in MgB_2

2001-06-08

arxiv.org/abs/cond-mat/0106166v1

Physics

Condensed Matter

Superconductivity

4 pages - EPS figures included

Scientific paper

The temperature dependence of the London penetration depth, $\lambda(T)$, was measured in polycrystalline MgB$_2$ 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 fit to the data gives an effective energy gap $\Delta$ of $2.8\pm0.4$ meV ($2\Delta/k_BT_c=1.7\pm0.2$), 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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