Magneto-transport characteristics of La1.4Ca1.6Mn2O7 thin film deposited by spray pyrolysis
P. K. Siwach, H. K. Singh, O. N. Srivastava
Abstract
Polycrystalline thin films of double layer manganite La1.4Ca1.6Mn2O7 (DLCMO) have been deposited by nebulized spray pyrolysis on single crystal LaAlO3 substrates. These single phase films having grain size in the range 70-100 nm exhibit ferromagnetic transition at TC ~ 107K. The short range ferromagnetic ordering due to in plane spin coherence is evidenced to occur at a higher temperature around 225 K. Insulator/semiconductor to metal transition occurs at a lower temperature TP ~ 55K. The transport mechanism above TC is of Mott`s variable range hopping type. Below TC the current-voltage characteristics show non-linear behaviour that becomes stronger with decreasing temperature. At low temperatures below TCA ~ 30K a magnetically frustrated spin canted state is observed. The DLCMO films exhibit resonable low field magnetoresistance and at 77K the magnetoresistance ratio is ~ 5% at 0.6 kOe and \~ 13% at 3 kOe.
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