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      https://www.ias.ac.in/article/fulltext/boms/034/07/1501-1506

    • Keywords

       

      Metal insulator transition; spin glass transition; solid-state reaction route.

    • Abstract

       

      A series of Ce-doped (1–20 mol%) La0.67Ca0.33MnO3 (LCMO) sintered (1400°C) ceramic samples were prepared by the solid-state reaction route. The significant enhancement of metal insulator transition temperature ($T_{\text{IM}} \approx$ 280 K) and Curie transition temperature ($T_{c} \approx$ 270 K) associated with LCMO system by the addition of 10 mol% of Ce has been observed. Further interesting observation showed that both low (≈ 1 mol%) and high (≥ 15 and 20 mol%) level of Ce-doping in LCMO reduced the $T_{\text{IM}}$ appreciably from 280 K to 220 K, and from 100 to 160 K, respectively exhibiting the signature of a unique spin glass transitions at around 30 K. Structural and spectroscopic studies revealed that unreacted CeO2 and MnO2 phases are found to be present in 1, 15, 20 mol% Ce-doped LCMO samples, which is one of the reasons why they show spin glass transition at low temperature. Our present results on bulk Ce-doped (10 mol%) LCMO are found to be encouraging as far as $T_{\text{IM}}$ of epitaxial La0.7Ce0.3MnO3 thin film ($T_{\text{IM}} \approx$ 250 K) is concerned. This finding suggests that single-phase materials of Ce-doped (10 mol%) LCMO can be prepared with enhanced $T_{\text{IM}}$ effectively using solid-state reaction route.

    • Author Affiliations

       

      D K Mishra1 D R Sahu2 P K Mishra3 S K Singh1 B K Mohapatra1 B K Roul4

      1. Advanced Materials Technology Department, Institute of Minerals and Materials Technology (CSIR), Bhubaneswar 751 013, India
      2. School of Physics and DST/NRF Centre of Excellence in Strong Materials, University of the Witwatersrand, Private Bag 3, Wits 2050, Johannesburg, South Africa
      3. Technical Physics and Prototype Engineering Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
      4. Institute of Materials Science, Planetarium Building, Bhubaneswar 751 013, India
    • Dates

       
  • Bulletin of Materials Science | News

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