Doping evolution of the absolute value of the London penetration depth and superfluid density in single crystals of Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$

Abstract

The zero temperature value of the in-plane London penetration depth, ${\lambda }_{ab}(0)$, has been measured in single crystals of Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ as a function of the Co concentration, $x$, across both the underdoped and overdoped superconducting regions of the phase diagram. For $x\gtrsim 0.047$, ${\lambda }_{ab}(0)$ has been found to have values between 120 $\pm$ 50~nm and 300 $\pm$ 50~nm. A pronounced increase in ${\lambda }_{ab}(0)$, to a value as high as 950 $\pm$ 50~nm, has been observed for $x\lesssim 0.047$, corresponding to the region of the phase diagram where the itinerant antiferromagnetic and superconducting phases coexist and compete. Direct determination of the doping-dependent ${\lambda }_{ab}(0)$ has allowed us to track the evolution of the temperature-dependent superfluid density, from which we infer the development of a pronounced superconducting gap anisotropy at the edges of the superconducting dome.

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• $a-b$ Plane Point Contact Spectroscopy measurements of optimally Cobalt doped Ba-122 iron-pnictide superconductors