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Magnetoresistance Effect in Sol-gel Prepared Double Layered CMR Manganite Nd1.2Sr1.8Mn2O7

Y. S. Reddy

Department of Physics, Chaitanya Bharathi Institute of Technology (A), Gandipet, Hyderabad - 500 075 INDIA.

ABSTRACT

A polycrystalline double layered colossal magnetoresistive manganite Nd1.2Sr1.8Mn2O7 was prepared by sol-gel method and characterized using powder X-ray diffraction. The sample shows single phase body-centered tetragonal structure. The electrical resistivity measurements, both in absence and presence of applied magnetic field, were undertaken in the temperature range 70 K - 300 K. The sample shows an insulator-to-metal transition temperature (TIM) at 86 K. The analysis of temperature dependent resistivity data above TIM reveals that the conduction follows Mott type of variable range of hopping mechanism. The sample shows MR ≈ 30% at TIM with an applied magnetic field of 3 T.

Keywords : Magnetoresistance, Variable range hopping, Conduction process, Layered perovskite, Manganite.