The London penetration depth in single crystals of Ba(Fe_{1-x}Co_x)_2As_2 at various doping levels

Details The London penetration depth in single crystals of Ba(Fe_{1-x}Co_x)_2As_2 at various doping levels The London penetration depth in single crystals of Ba(Fe_{1-x}Co_x)_2As_2 at various doping levels

2008-12-19

arxiv.org/abs/0812.3683v1

Phys. Rev. B 79, 100506(R) (2009)

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevB.79.100506

The London penetration depth $\lambda(T)$ has been measured in single crystals of Ba(Fe$_{1-x}$Co$_{x}$)$_{2}$As$_{2}$ using the tunnel diode resonator technique. The measured doping levels of $x=$~0.038, 0.047, 0.058, 0.074 and 0.10 range from underdoped to overdoped concentrations. The measurements have shown that the density of carriers participating in superconductivity decreases sharply in the underdoped regime, but the penetration depth as a function of temperature exhibits a robust power law, $\Delta\lambda(T)\sim T^{n}$, for all measured dopings, with $n$ between 2 and 2.5. We discuss the implications of these results and possible interpretations of such robust behavior.

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