Magnetic and magnetoresistance effect of needle shaped crystal and slightly Co rich Ca₃Co₂O₆ was investigated in a temperature range between 2 K and 100 K and in a DC magnetic field range less than 7 T and in pulsed fields less than 20 T. We found 1/3 ms and 2/3 ms plateaus of the magnetization for the full magnetization ms and large negative and positive magnetoresistance peaks of 10% at the same magnetic fields, respectively.

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1. Giant magnetoresistance in p-n junction composed of betaFeSi₂ - Si