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The electrical transport properties of highly oriented pyrolytic graphite (HOPG) have been studied. Huge magnetoresistances (MR), up to 4950% at 300 K and 85300% at 4.2 K in magnetic fields of 8.15 T, respectively, were found. The Shubnikov-de Hass (S-dH) oscillations have been observed clearly. The huge magnetoresistance at room temperature makes graphite a strong candidate for magnetic field sensing...
Magnetotransport properties of a two-layered La 2-2x Ca 1+2x Mn 2 O 7 (x=0.2) polycrystal have been studied as function of temperatures and applied fields. It was found that the variation of the resistivity with temperature at high temperatures obeys the variable-range hopping law under various applied fields. Two maxima of magnetoresistance...
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