Endohedral gallide cluster superconductor Mo8Ga41 indicated some unusual superconducting properties that deviated from BCS theory. This was ascribed to possible multi-gap superconductivity. Moreover, these properties seem to vanish after the substitution of vanadium atom for molybdenum. Here, we present a local magnetization study of both compounds, Mo8Ga41 and Mo7VGa41. An array of miniature Hall probes was used to study magnetic profile which reflects vortex distribution inside the sample.

more »

... vortex pinning observed in both materials is strong. Calculated critical current density values suggest, that vortex pinning in Mo8Ga41 manifests itself to a greater extent than in Mo7VGa41.