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

TL;DR

This study investigates how substituting Al into Pr0.5Ca0.5MnO3 affects its structure, magnetism, and transport properties, revealing the robustness of charge ordering despite impurity doping and minimal lattice distortion.

Contribution

It provides new insights into the effects of non-magnetic Al substitution on charge ordering and transport mechanisms in Pr0.5Ca0.5MnO3, highlighting the robustness of charge order.

Findings

Charge ordering persists up to 10% Al doping.

Charge transport follows small polaron hopping above transition.

Mott's variable range hopping dominates below transition.

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.