Superconductivity in a PbFCl-type pnictide: NbSiAs Gihun Ryu, Sung Wng Kim, Hiroshi Mizoguchi, Satoru Matsuishi and Hideo Hosono EPL, 99 2 (2012) 27002 Published online: 17 July 2012 DOI: 10.1209/0295-5075/99/27002