Low temperature electrical and magnetic behaviour of Sr Doped LCMO manganites

To understand the complex conduction mechanism and electrical transport properties of manganite materials a series of strontium doped LCMO manganites with compositional formula La_0.67Ca_0.33-xSr_xMnO₃ have been synthesized. The samples were characterized structurally by XRD and AC susceptibility measurements were undertaken to determine T_c. A systematic investigation of electrical resistivity over a temperature range 5–300 K was done to determine metal-insulator transition temperature (T_P). Anomalies were observed at temperatures below 50 K and the observed behavior has been explained using electron- electron interactions, Kondo like scattering and electron- phonon interactions.