Superconductivity in the non-oxide perovskite MgCNi3. by He, T, Huang, Q, Ramirez, A, Wang, Y, Regan, K, Rogado, N, Hayward, M, Haas, M, Slusky, J, Inumara, K, Zandbergen, H, Ong, N, Cava, R