Physics – Condensed Matter – Superconductivity
Scientific paper
2010-05-12
Phys. Rev. B 82 (2010) 094512
Physics
Condensed Matter
Superconductivity
7 pages, accepted for publication in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.82.094512
We report muon spin rotation ($\mu$SR) measurements of single crystal Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$ and Sr(Fe$_{1-x}$Co$_x$)$_2$As$_2$. From measurements of the magnetic field penetration depth $\lambda$ we find that for optimally- and over-doped samples, $1/\lambda(T\to 0)^2$ varies monotonically with the superconducting transition temperature T$_{\rm C}$. Within the superconducting state we observe a positive shift in the muon precession signal, likely indicating that the applied field induces an internal magnetic field. The size of the induced field decreases with increasing doping but is present for all Co concentrations studied.
Aczel A. A.
Baggio-Saitovitch Elisa
Bud'ko Sergey L.
Canfield Paul. C.
Carlo Jeremy P.
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