Synthesis of ErFeAsO-based superconductors by the hydrogen doping methodParasharam M. Shirage, Kiichi Miyazawa, Kunihiro Kihou, Chul-Ho Lee, Hijiri Kito, Kazuyasu Tokiwa, Yasumoto Tanaka, Hiroshi Eisaki and Akira IyoEPL, 92 5 (2010) 57011DOI: https://doi.org/10.1209/0295-5075/92/57011