Sr0.9K0.1Zn1.8Mn0.2As2: A ferromagnetic semiconductor with colossal magnetoresistance Xiaojun Yang, Qian Chen, Yupeng Li, Zhen Wang, Jinke Bao, Yuke Li, Qian Tao, Guanghan Cao and Zhu-An Xu EPL, 107 6 (2014) 67007 Published online: 24 September 2014 DOI: 10.1209/0295-5075/107/67007