FAST TRACK COMMUNICATION: Pressure-induced superconductivity in CaFe2As2

We report pressure-induced superconductivity in a single crystal of CaFe₂As₂. At atmospheric pressure, this material is antiferromagnetic below 170 K but under an applied pressure of 0.69 GPa becomes superconducting, with a transition temperature T_c exceeding 10 K. The rate of T_c suppression with applied magnetic field is -0.7 K T^-1, giving an extrapolated zero-temperature upper critical field of 10-14 T.