Evidence for weak electronic correlations in Fe-pnictides

W. L. Yang, A. P. Sorini, C-C. Chen, 3 B. Moritz, W.-S. Lee, F. Vernay, P. Olalde-Velasco, 5 J. D. Denlinger, B. Delley, J.-H. Chu, 6, 7 J. G. Analytis, 6, 7 I. R. Fisher, 6, 7 Z. A. Ren, J. Yang, W. Lu, Z. X. Zhao, J. van den Brink, 9 Z. Hussain, Z.-X. Shen, 6, 7, 3 and T. P. Devereaux 7 Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720 Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA. Department of Physics, Stanford University, Stanford, California 94305, USA Paul Scherrer Institut, Condensed Matter Theory Group, Villigen PSI, Switzerland Instituto de Ciencias Nucleares, UNAM, 04510 Mexico DF, Mexico Department of Applied Physics, Stanford University, Stanford, California 94305, USA Geballe Laboratory for Advanced Materials, Stanford University, Stanford, CA 94305, USA. National Lab for Superconductivity, Institute of Physics, Chinese Academy of Sciences, Beijing, P. R. China. Institute Lorentz for Theoretical Physics, Leiden University, P.O. Box 9506, 2300 RA Leiden, The Netherlands (Dated: May 15, 2009)