Effect of Al substitution on the charge ordered Pr{_0.5}Ca{_0.5}MnO{_3}: Structure, Magnetism and Transport

Abstract

We report the effect of Mn site substitution of Al on the structural, magnetic and transport properties of charge ordered Pr{_0.5}Ca{_0.5}MnO{_3}. This substitution introduces impurities in the Mn-O-Mn network, causes the Mn{^3+}/Mn{^4+} ratio to deviate away from unity and is seen to predominantly replace Mn{^4+}. The strength of charge ordering is supressed with increasing Al doping, as is seen from ac susceptibility, the magnetocaloric effect and dc resistivity. The observation of traces of charge ordering over an extended range of impurity doping of 10% besides being indicative of the robust nature of charge ordering in Pr{_0.5}Ca{_0.5}MnO{_3}, also underscores the relatively insignificant effect that Al substitution has on the lattice distortions and the importance of non-magnetic substitutions. For all the samples, the conductivity in the temperature range above the charge ordering transition is observed to be due to the adiabatic hopping of small polarons, whereas below the charge ordering transition, Mott's variable range hopping mechanism is seen to be valid.

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• Coexisting tuneable fractions of glassy and equilibrium long-range-order phases in manganites
• Conversion of glassy antiferromagnetic-insulating phase to equilibrium ferromagnetic-metallic phase by devitrification and recrystallization in Al substituted Pr${}_{0.5}$Ca${}_{0.5}$MnO${}_3$
• Selective dilution and magnetic properties of La_{0.7}Sr_{0.3}Mn_{1-x}M'_xO_3 (M' = Al, Ti)
• Magnetocaloric effect and nature of magnetic transition in nanoscale Pr0.5Ca0.5MnO3
• Influence of B - site Disorder in $L{a}_{0.5}C{a}_{0.5}M{n}_{1-x}{B}_x{O}_3$ (B = Fe, Ru, Al and Ga) Manganites
• Selective substitution in orbital domains of a low doped manganite : an investigation from Griffiths phenomenon and modification of glassy features
• Non-equilibrium magnetic response of canonical spin glass and magnetic glass
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• Scaling behavior of Charge order melting in Magnetic field-Pressure-Temperature space of 2.5% Al doped Pr${}_{0.5}$Ca${}_{0.5}$MnO${}_3$