Superconductivity at Tc = 44 K in Lix Fe2 Se2 (NH3)y E.-W. Scheidt, V.R. Hathwar, D. Schmitz, A. Dunbar, W. Scherer, F. Mayr, V. Tsurkan, J. Deisenhofer and A. Loidl Eur. Phys. J. B, 85 8 (2012) 279 Published online: 08 August 2012 DOI: 10.1140/epjb/e2012-30422-6