POSITIVE MAGNETORESISTIVITY OF FE0.95CO0.05GE2 SINGLE-CRYSTALS INSIDETHE REGION OF A MAGNETIC PHASE-TRANSITION

We report on the detection of two narrow peaks of positive magnetoresi stivity in the temperature dependence of the magnetoresistivity of a F e0.95Co0.05Ge2 single crystal in the vicinity of a ''smeared'' first-o rder phase transition. The position of these peaks correlates with the position of singularities in the temperature dependence of the temper ature derivative of the electrical resistivity and magnetic susceptibi lity. We show that these singularities in the transport and magnetic p roperties are, probably due to the presence of two percolation transit ions with temperature in the magnetic subsystem of the crystal. (C) 19 97 American Institute of Physics.