Universal linear-temperature dependence of static magnetic susceptibility in iron pnictides G. M. Zhang, Y. H. Su, Z. Y. Lu, Z. Y. Weng, D. H. Lee and T. Xiang EPL, 86 3 (2009) 37006 Published online: 18 May 2009 DOI: 10.1209/0295-5075/86/37006