The unusual thickness dependence of superconductivity in $α$-MoGe thin films

Details The unusual thickness dependence of superconductivity in $α$-MoGe thin films The unusual thickness dependence of superconductivity in $α$-MoGe thin films

2008-03-07

arxiv.org/abs/0803.1185v1

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevB.78.014509

Thin films of $\alpha$-MoGe show progressively reduced $T_{c}$'s as the thickness is decreased below 30 nm and the sheet resistance exceeds 100 $\Omega/\Box$. We have performed far-infrared transmission and reflection measurements for a set of $\alpha$-MoGe films to characterize this weakened superconducting state. Our results show the presence of an energy gap with ratio $2\Delta_0/k_BT_{c} = 3.8 \pm 0.1$ in all films studied, slightly higher than the BCS value, even though the transition temperatures decrease significantly as film thickness is reduced. The material properties follow BCS-Eliashberg theory with a large residual scattering rate except that the coherence peak seen in the optical scattering rate is found to be strongly smeared out in the thinner superconducting samples. A peak in the optical mass renormalization at $2\Delta_0$ is predicted and observed for the first time.

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