New alkali-metal and 1,2-Diaminopropane intercalated superconductor Lix(C3H10N2)yFe2Se2 with Tc = 45 K

A new iron-based superconductor Li x (C 3 H 10 N 2 ) y Fe 2 Se 2 was successfully synthesized via the novel ammonothermal technique. After post-annealing, the superconducting transition temperature T c changes from 36 K to 45 K, which is confirmed by measurements of the magnetic susceptibility and the electrical resistivity. The powder X-ray diffraction (XRD) measurements have revealed that the crystal structure keeps the same after post-annealing at 130 °C for 10 h. Hall coefficient and magnetoresistance (MR) have been measured on the annealed samples, indicating the role of electrons as the dominant charge carriers.