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A Sharp Peak of the Zero-Temperature Penetration Depth at Optimal Composition in BaFe <sub>2</sub> (As <sub>1โ€“</sub> <i> <sub>x</sub> </i> P <i> <sub>x</sub> </i> ) <sub>2</sub>

A Sharp Peak of the Zero-Temperature Penetration Depth at Optimal Composition in BaFe <sub>2</sub> (As <sub>1โ€“</sub> <i> <sub>x</sub> </i> P <i> <sub>x</sub> </i> ) <sub>2</sub>

In a superconductor, the ratio of the carrier density, $n$, to their effective mass, $m^*$, is a fundamental property directly reflecting the length scale of the superfluid flow, the London penetration depth, $\lambda_L$. In two dimensional systems, this ratio $n/m^*$ ($\sim 1/\lambda_L^2$) determines the effective Fermi temperature, $T_F$. We report โ€ฆ