Abstract
The superconducting anisotropy γ has been studied on single-crystalline Ba(Fe0.93Co0.07)2As2(Tc=22.5K) at temperatures T⩾20K and fields H⩽10T by measuring magnetic torque τ as a function of angle θ between the c axis and the H direction. The reversible part in τ(θ) can be well-described with γ=3–3.5, which is almost T and H independent within the measurement range. The result manifests that this material, known as the multigap superconductor, behaves as a simple anisotropic superconductor at least near Tc. The irreversible part in τ(θ) shows broad peak at θ=90°, indicating the absence of strong layer pinning.
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