Superconductivity and field-induced magnetism in SrFe&lt;sub&gt;1.75&lt;/sub&gt;Co&lt;sub&gt;0.25&lt;/sub&gt;As&lt;sub&gt;2&lt;/sub&gt;

Khasanov, R.; Maisuradze, A.; Maeter, H.; Kwadrin, A.; Luetkens, H.; Amato, A.; Schnelle, W.; Rosner, H.; Leithe-Jasper, A.; Klauss, H.-H.

doi:10.1103/PhysRevLett.103.067010

Superconductivity and field-induced magnetism in SrFe_1.75Co_0.25As₂

Khasanov R, Maisuradze A, Maeter H, Kwadrin A, Luetkens H, Amato A, Schnelle W, Rosner H, Leithe-Jasper A & Klauss H-H

Citation

Khasanov, R., Maisuradze, A., Maeter, H., Kwadrin, A., Luetkens, H., Amato, A., … Klauss, H. H. (2009). Superconductivity and field-induced magnetism in SrFe_1.75Co_0.25As₂. Physical Review Letters, 103(6), 067010 (4 pp.). https://doi.org/10.1103/PhysRevLett.103.067010

Persistent URL https://www.dora.lib4ri.ch/psi/islandora/object/psi:17379

Using muon-spin rotation, we studied the in-plane (λ_ab) and the out of plane (λ_c) magnetic field penetration depth in SrFe_1.75Co_0.25As₂ (T_c ≃ 13.3 K). The penetration depth anisotropy γ_λ = λ_c/λ_ab increases from γ_λ ≃ 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.