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

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

2008-01-25

arxiv.org/abs/0801.3981v3

J. Mater. Chem. 18, 4280 (2008)

Physics

Condensed Matter

Materials Science

34 pages, parts of the work is published in JMC

Scientific paper

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.

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