A Sharp Peak of the Zero-Temperature Penetration Depth at Optimal Composition in BaFe2(As1-xPx)2

Abstract

In a superconductor, the ratio of the carrier density, $n$, to their effective mass, $m^{\ast }$, 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 $n/m^{\ast }$ ($\sim 1/{\lambda }_L^2$) determines the effective Fermi temperature, $T_F$. We report a sharp peak in the $x$-dependence of ${\lambda }_L$ at zero temperature in clean samples of BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$ at the optimum composition $x=0.30$, where the superconducting transition temperature $T_c$ reaches a maximum of 30\,K. This structure may arise from quantum fluctuations associated with a quantum critical point (QCP). The ratio of $T_c/T_F$ at $x=0.30$ is enhanced, implying a possible crossover towards the Bose-Einstein condensate limit driven by quantum criticality.

Main text (5 pages, 4 figures) + Supplementary Materials (5 pages, 5 figures). Published on June 22, 2012

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