(a) Magnetoresistance curves versus at 45, 50, and 60 K for sample FP1. Straight lines are linear fits of the data. The inset shows the Hall effect data for sample VdP1 at 60 K for magnetic fields up to 14 T. The straight line is a linear fit of the data. (b) Magnetoresistance curves versus at 20 and 25 K. Straight lines are linear fits of the data at high magnetic fields.