We have measured the transverse magnetoresistance (B ⊥ I) at T = 4 K of a high quality single crystal of SmB6 in magnetic fields up to 50 T. A relatively large negative transverse magnetoresistance of about 45% at 50 T is observed. The negative transverse magnetoresistance is quadratic in field up to the highest field applied. The effect of high magnetic field on the gap formation of this material will also be discussed. © 1994.

Low temperature magnetoresistivity of UBe13 shows that the interactions between heavy fermions are field dependent. This suggests a field variation of the superconducting condensation energy. The Hall resistivity is strongly nonlinear in magnetic field. © 1988.