Institution: | 1. Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;2. Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-1000 Berlin 33, F.R.G.;3. Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-1000 Berlin 33, West Germany;4. Institute of Physics of the University, P.O. Box 304, 41001 Zagreb, Croatia, Yugoslavia |