Z.-H. Liu, P. Richard, 3 K. Nakayama, G.-F. Chen, S. Dong, J.-B. He, D.-M. Wang, T.-L. Xia, K. Umezawa, T. Kawahara, S. Souma, T. Sato, 5 T. Takahashi, 4 T. Qian, Yaobo Huang, Nan Xu, Yingbo Shi, H. Ding, and S.-C. Wang ∗ 1 Department of Physics, Renmin University, Beijing, 100872, China. WPI Research Center, Advanced Institute for Material Research, Tohoku University, Sendai 980-8577, Japan. Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences Beijing 100190, China Department of Physics, Tohoku University, Sendai 980-8578, Japan. TRiP, Japan Science and Technology Agency (JST), Kawaguchi 332-0012, Japan.