Intercalation effect on hyperfine parameters of Fe in FeSe superconductor with Tc = 42 K Sergii I. Shylin, Vadim Ksenofontov, Stefan J. Sedlmaier, Simon J. Clarke, Simon J. Cassidy, Gerhard Wortmann, Sergey A. Medvedev and Claudia Felser EPL, 109 6 (2015) 67004 Published online: 25 May 2015 DOI: 10.1209/0295-5075/109/67004