Energy gaps in the failed high-Tc superconductor La1.875Ba0.125CuO4

Energy gaps in the failed high-Tc superconductor La1.875Ba0.125CuO4 Rui-Hua He, Kiyohisa Tanaka, Sung-Kwan Mo, Takao Sasagawa, Masaki Fujita, Tadashi Adachi, Norman Mannella, Kazuyoshi Yamada, Yoji Koike, Zahid Hussain, Zhi-Xun Shen Department of Physics, Applied Physics and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305, USA Advanced Light Source, Lawrence Berkeley National Lab, Berkeley, California 94720, USA Institute of Materials Research, Tohoku University, Sendai 980-8577, Japan Materials and Structures Laboratory, Tokyo Institute of Technology, Kanagawa 226-8503, Japan Department of Applied Physics, Tohoku University, Sendai 980-8579, Japan and Department of Physics, Osaka University, Osaka 560-0043, Japan (Dated: February 14, 2008)