Non-stoichometry and the magnetic structure of Sr2CrO3FeAs M. Tegel, F. Hummel, Y. Su, T. Chatterji, M. Brunelli and D. Johrendt EPL, 89 3 (2010) 37006 Published online: 23 February 2010 DOI: 10.1209/0295-5075/89/37006