Low-Energy Electronic Structure of the Kondo Insulator YbB12.

T. Susaki,1 A. Sekiyama,1 K. Kobayashi,1 T. Mizokawa,1 A. Fujimori,1 M. Tsunekawa,2 T. Muro,2 T. Matsushita,2,* S. Suga,2 H. Ishii,3 T. Hanyu,3 A. Kimura,4 H. Namatame,5 M. Taniguchi,5 T. Miyahara,6 F. Iga,5 M. Kasaya,7 and H. Harima8 1Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113, Japan 2Department of Material Physics, Osaka University, Toyonaka, Osaka 560, Japan 2Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-03, Japan 4Institute for Solid State Physics, University of Tokyo, Roppongi, Minato-ku, Tokyo 106, Japan 5Department of Materials Sciences, Hiroshima University, Higashi-Hiroshima 739, Japan 6Photon Factory, National Laboratory for High Energy Physics, Tsukuba, Ibaraki 305, Japan 7Department of Physics, Tohoku University, Sendai 980-77, Japan 8College of Integrated Arts and Science, University of Osaka Prefecture, Gakuen-cho, Sakai 593, Japan (Received 20 May 1996; revised manuscript received 31 July 1996)