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  Physics Express 2013, 3: 17
  Research Article
Magnetotransport properties of lanthanum based colossal magnetoresistance manganites synthesized by using PVA gel route
  D. C. Krishnaa, b, Y. Kalyana Lakshmia, P. Venugopal Reddya  
a Department of Physics, Osmania University, Hyderabad-500 007, India
b Bhavan’s New Science College, Narayanaguda, Hyderabad -500029, India

  With a view to understand the effect of sintering temperature on magnetic and electric behavior of perovskite manganites, a series of materials with compositional formula, La0.67A0.33MnO3 (where A=Ca, Sr, Pb, and Ba) were prepared by PVA-gel route. The electric and magnetic transitions increase with increasing sintering temperature, while after an initial increase they are found to decrease with increasing average A-site ionic radii. The observed behavior was explained using core-shell model and cation mismatch effect. The electrical resistivity data over the entire temperature region is fitted to Effective Medium Approximation model.
  Colossal magnetoresistance; Manganites; Spin Glass; Grain boundary; Small polaron  

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