Magnetic and magnetotransport studies on ternary topological insulator GeBi4Te7

Temperature and magnetic field dependence of the transport and magnetic properties of ternary topological insulator GeBi4Te7 have been studied. Magnetization data shows that the sample remains diamagnetic from 300 K down to 2.5 K whereas, resistivity decreases as temperature decreases and reaches a minimum at 210 K. It increases furtherand attains a maximum at 124 K and then decreases upon reducing the temperature. R (T) measured at 0-15 T shows positive magnetoresistance (MR). The calculated MR % at T