Structural control of d-f interaction in the CeFe1−xRuxAsO system Cao Wang, Hao Jiang, Yongkang Luo, Chunmu Feng, Wenxian Li, Zhu'an Xu, Guanghan Cao, Jung Ho Kim and Shixue Dou EPL, 99 5 (2012) 57009 Published online: 14 September 2012 DOI: 10.1209/0295-5075/99/57009