Structural, magnetic and transport properties of Ca and Sr doped Lanthanum manganites


  • Sunita KESHRI Department of Physics, Birla Institute of Technology, Mesra, RANCHI, 835215, INDIA
  • Shailendra Rajput Department of Physics, Shri Krishna University, CHHATARPUR, 471001, INDIA
  • Sonali BISWAS Department of Physics, Birla Institute of Technology, Mesra, RANCHI, 835215, INDIA
  • Leena Joshi Department of Physics, St. Xavier’s College Bombay, MUMBAI, 400001, INDIA
  • Wojciech SUSKI Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, WROCLAW 2, 50-950, POLAND
  • Piotr WIŚNIEWSKI Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, WROCLAW 2, 50-950, POLAND


Manganite, Resistivity, Magnetization, Thermoelectric power


This article presents a comparative study for the effect of average A-site cation size on the structural, transport and magnetic properties of Lanthanum manganites. Three polycrystalline colossal magneto-resistive compounds were synthesized using standard solid state reaction method. The electrical resistivity data were analyzed employing standard two-phase model to understand the conduction mechanism. The resistance of polycrystalline ceramic depends on the intragrain resistance (intrinsic resistance) and the intergrain or grain-boundary resistance (extrinsic resistance). The substitution of Sr ions at La-site provides higher magnetic and metal-insulator transitions as compared to Ca ions. The combined substitution of Ca and Sr ions at La-site offers nearby room temperature magnetic and metal-insulator transitions. Irreversibility in the temperature dependent DC magnetization is observed in the zero-field-cooled and field-cooled measurements. It is noticed that the larger average radius of the A-site cations possesses higher magnetic and metal-insulator transition temperatures. Temperature dependent thermoelectric power curves show a hump like behavior, which indicates a smooth transition from the low-temperature metallic behavior to high-temperature semiconductor-like behavior.


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How to Cite

S. . KESHRI, S. Rajput, S. . BISWAS, L. Joshi, W. . SUSKI, and P. . WIŚNIEWSKI, “Structural, magnetic and transport properties of Ca and Sr doped Lanthanum manganites”, J. Met. Mater. Miner., vol. 31, no. 4, pp. 62-68, Dec. 2021.



Original Research Articles