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We report the detection of unusual superconductivity up to 49 K in singlecrystalline CaFe2As2 via electron-doping by partial replacement of Ca byrare-earth. The superconducting transition observed suggests the possibleexistence of two phases: one starting at ~ 49 K, which has a low critical field~ 4 Oe, and the other at ~ 21 K, with a much higher critical field > 5 T. Ourobservations are in strong contrast to previous reports of doping orpressurizing layered compounds AeFe2As2 (or Ae122), where Ae = Ca, Sr or Ba. InAe122, hole-doping has been previously observed to generate superconductivitywith a transition temperature (Tc) only up to 38 K and pressurization has beenreported to produce superconductivity with a Tc up to 30 K. The unusual 49 Kphase detected will be discussed.

The Unusual Superconducting State at 49 K in Electron-Doped CaFe2As2 at Ambient