J un 2 01 1 Anisotropic resistivity in underdoped single crystals ( Ba 1 − x K x ) Fe 2 As 2 , 0 ≤ x < 0 . 35

M. A. Tanatar, ∗ E. C. Blomberg, 2 Hyunsoo Kim, 2 Kyuil Cho, 2 W. E. Straszheim, Bing Shen, Hai-Hu Wen, 4, 5 and R. Prozorov Ames Laboratory, Ames, Iowa 50011, USA Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA Institute of Physics, Chinese Academy of Sciences, Beijing 100190, P. R. China National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, P. R. China Canadian Institute for Advanced Research, Toronto, Ontario, Canada (Dated: November 10, 2018)