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

Abstract

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.

References in corpus (16)

• Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsO${}_{1-x}$F${}_x$}
• Magnetism, superconductivity, and pairing symmetry in Fe-based superconductors
• Effects of Co substitution on thermodynamic and transport properties and anisotropic $H_{c2}$ in Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ single crystals
• Magnetic Penetration Depth in Unconventional Superconductors
• The BCS-like gap in superconductor SmFeAsO_0.85F_0.15
• Multiple Superconducting Phases in New Heavy Fermion Superconductor PrOs4Sb12
• A key role for unusual spin dynamics in ferropnictides
• Microwave Penetration Depth and Quasiparticle Conductivity in PrFeAsO_1-y Single Crystals : Evidence for a Full-Gap Superconductor
• NMR relaxation rate in superconducting pnictides: extended $s_{\pm }$ scenario
• Nonlocal Effects on the Magnetic Penetration Depth in d-wave Superconductors
• Superfluid density of the $\pm$s-wave state for the iron-based superconductors
• Resonant impurity scattering in the $\pm$s-gap state of the Fe-based superconductors
• Possible pairing states of the Fe-based superconductors
• Nodal Superconductivity with Multiple Gaps in SmFeAsO${}_{0.9}$F${}_{0.1}$
• Possible two-gap superconductivity in NdFeAs(O,F) probed by point-contact Andreev-reflection spectroscopy
• Quantum-critical superconductivity in underdoped cuprates

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