Observation of Magnetic-Field-Induced Superconductivity

A new superconducting state induced by an external magnetic field has been observed in the pseudoternary Eu-Sn molybdenum chalcogenides for different Eu concentrations. This phenomenon is explained in terms of the Jaccarino-Peter compensation effect which accounts correctly for the shape of the ${H}_{c2}\ensuremath{-}T$ phase diagram.