Unconventional London penetration depth in Ba(Fe0.93Co0.07)2As2 single crystals

Details Unconventional London penetration depth in Ba(Fe0.93Co0.07)2As2 single crystals Unconventional London penetration depth in Ba(Fe0.93Co0.07)2As2 single crystals

2008-10-13

arxiv.org/abs/0810.2295v1

Phys. Rev. Lett. 102, 127004 (2009)

Physics

Condensed Matter

Superconductivity

4 pages

Scientific paper

10.1103/PhysRevLett.102.127004

The London penetration depth, $\lambda(T)$, has been measured in several single crystals of Ba(Fe$_{0.93}$Co$_{0.07}$)$_2$As$_2$. Thermodynamic, electromagnetic, and structural characterization measurements confirm that these crystals are of excellent quality. The observed low temperature variation of $\lambda(T)$ follows a power-law, $\Delta \lambda (T) \sim T^n$ with $n=2.4 \pm 0.1$, indicating the existence of normal quasiparticles down to at least $0.02T_c$. This is in contrast to recent penetration depth measurements on single crystals of NdFeAsO$_{1-x}$F$_x$ and SmFeAsO$_{1-x}$F$_x$, which indicate an anisotropic but nodeless gap. We propose that a more three-dimensional character in the electronic structure of Ba(Fe$_{0.93}$Co$_{0.07}$)$_2$As$_2$ may lead to an anisotropic $s-$wave gap with point nodes that would explain the observed $\lambda(T)$.

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