IntroductionThe colossal magnetoresistance (CMR) manganites, RE1−xAxMnO3 (RE = rare earth, A = Ca, Sr, Ba,…) exhibit remarkable properties, such as antiferromagnetic insulators, charge ordering states, ferromagnetic insulators, ferromagnetic metallic states depending on doping concentrations of the divalent ions. These materials are fascinating due to the rich physics for understanding the interplay of charge, spin, and lattice degrees of freedom. CMR manganites exhibit the metal‐to‐insulator (MI) transitions or insulating behaviour due to the doping concentration of the holes or electrons. Several reports state that the phase separation is one of the key factors to achieve the large magnetoresistance in CMR manganites. The phase separation dominates when the ions of different nature doped into the manganites. For example, La0.67Sr0.33MnO3 is one of the ferromagnetic metallic manganites, while Bi0.67Sr0.33MnO3 is a charge ordered insulating manganite. When Bi is doped in La0.67Sr0.33MnO3, there is a competition of ferromagnetic metallic and charge ordering insulating phases occur. We have reported step wise magnetization behaviour for nominal Bi doping in La0.67Sr0.33MnO3 and the phase separation of the ferromagnetic metallic and antiferromagnetic charge ordering states for higher doping. The La0.37Bi0.3Sr0.33MnO3 has shown the phase competition of the ferromagnetic metallic and antiferromagnetic charge ordered states. Upon observing the phase transitions, coexisting phases
Physica Status Solidi (B) Basic Solid State Physics – Wiley
Published: Jan 1, 2018
Keywords: ; ; ;
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