Physics – Condensed Matter – Superconductivity
Scientific paper
2009-03-06
Phys. Rev. Lett. 103, 067010 (2009)
Physics
Condensed Matter
Superconductivity
4 pages, 3 figures
Scientific paper
Using muon-spin rotation, we studied the in-plane (\lambda_ab) and the out of plane (\lambda_c) magnetic field penetration depth in SrFe_1.75Co_0.25As_2 (T_c=13.3 K). Both \lambda_ab(T) and \lambda_c(T) are consistent with the presence of two superconducting gaps with the gap to T_c ratios 2\Delta/k_BT_c=7.2 and 2.7. The penetration depth anisotropy \gamma_\lambda=\lambda_c/\lambda_ab increases from \gamma_\lambda=2.1 at T_c to 2.7 at 1.6 K. The mean internal field in the superconducting state increases with decreasing temperature, just opposite to the diamagnetic response seen in magnetization experiments. This unusual behavior suggests that the external field induces a magnetic order which is maintained throughout the whole sample volume.
Amato Alessandro
Khasanov Rustem
Klauss Hans-Henning
Kwadrin A.
Leithe-Jasper Andreas
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