Magneto-transport and Magneto-dielectric effect in Bi-based Perovskite Manganites

TL;DR

This study investigates how cobalt and nickel substitutions affect the magnetic, electronic, and dielectric properties of Bi-based perovskite manganites, revealing enhanced ferromagnetism, significant magnetoresistance, and weak magneto-dielectric effects due to electronic phase separation.

Contribution

It provides new insights into the effects of Co and Ni doping on the magnetic and dielectric properties of La1.2Bi0.8Mn2-x(Ni/Co)xO6+d manganites, highlighting the role of electronic phase separation.

Findings

Ferromagnetic transition temperature increases with Ni and Co doping.

High magnetoresistance observed at low temperatures.

Weak magneto-dielectric effect attributed to spin-lattice interactions.

Abstract

The effect of cobalt and nickel substitutions for manganese on the physical properties of the perovskite manganite La1.2Bi0.8Mn2-x(Ni/Co)xO6+d, with x = 0.0-0.8, has been investigated. It is observed that the ferromagnetism is enhanced, TC being increased from 103 K for the parent compound (x = 0.0) to 178 K for Ni-phase, and to 181 K for the Co-phase (x = 0.8). Moreover, the systems remain insulating and depict relatively large values of magnetoresistance effect at low temperatures (up to 67 % at 90K and 70 kOe, for x = 0.0 phase). These phenomena are interpreted by means of electronic phase separation, where the ferromagnetic Mn4+/Ni2+ and Mn4+/Co2+ interactions reinforce the Mn3+/Mn4+ interactions by super-exchange interaction. The dielectric measurements below the magnetic transition temperatures exhibit weak magneto-dielectric effect of around 0.25% at 80K, which may be due to spin-lattice interaction.