• Effect of cobalt substitution on magnetic and transport properties of Nd0.5Sr0.5Mn1−𝑥Co𝑥O3 (𝑥 = 0.1, 0.3 and 0.5)

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      https://www.ias.ac.in/article/fulltext/boms/034/02/0279-0282

    • Keywords

       

      Manganites; cobaltates; magnetic properties; spin state transition; charge order.

    • Abstract

       

      The magnetic and transport properties of the compounds Nd0.5Sr0.5Mn1−𝑥Co𝑥O3 (𝑥 = 0.1, 0.3 and 0.5), synthesized by citrate–gel route have been investigated. The spin transition in cobaltates at low temperatures affects the magnetic as well as transport properties. The irreversibility behaviour between the zero-field cooled (ZFC) and field cooled (FC) magnetization as a function of temperature becomes stronger with increasing Co content. This is understood on the basis of glassy behaviour, which becomes more robust with increasing Co substitution. The non-saturating M–H behaviour indicates strong magnetic inhomogeneities which may cause the magnetic phase separation at the nanoscopic length scale. The double exchange interaction is stronger between Mn3+–O2−–Mn4+ as compared to Co3+–O2-–Co4+ pairs. Co-substitution suppresses the double exchange which will lead to cluster/spin glass like behaviour as well as semiconducting features due to localization of charge carriers (mobile 𝑒g electrons).

    • Author Affiliations

       

      Saket Asthana1

      1. Advanced Functional Materials Laboratory, Department of Physics, Indian Institute of Technology Hyderabad Ordnance Factory Estate Yeddumailaram 502 205 Andhra Pradesh, India
    • Dates

       
  • Bulletin of Materials Science | News

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