X-ray diffraction study of spontaneous strain in Fe-pnictide superconductor, NdFeAsO0.89F0.11 H. Fujishita, Y. Hayashi, M. Saito, H. Unno, H. Kaneko, H. Okamoto, M. Ohashi, Y. Kobayashi and M. Sato Eur. Phys. J. B, 85 2 (2012) 52 Published online: 08 February 2012 DOI: 10.1140/epjb/e2011-20336-2