The transverse magnetoresistance is measured up to 32 T for the field direc
tion [0 0 1] ii as well as some other directions and the magnetic phase dia
gram is derived for each direction. The Half resistivity is measured up to
26 T for the field direction [0 0 1]. Results indicate strong magnetic anis
otropy and an appreciable change of the electronic structure at a magnetic
phase transition. (C) 2000 Elsevier Science B.V. All rights reserved.