Magnetic relaxation and collective vortex creep in FeTe0.6Se0.4 single crystalYue Sun, Toshihiro Taen, Yuji Tsuchiya, Sunseng Pyon, Zhixiang Shi and Tsuyoshi TamegaiEPL, 103 5 (2013) 57013DOI: https://doi.org/10.1209/0295-5075/103/57013