Regular Article
Magnetic and Electrical Properties of Bi1−xSrxMnO3: Hole-Doping Effect on Ferromagnetic Perovskite BiMnO3

https://doi.org/10.1006/jssc.1997.7432Get rights and content

Abstract

Although La3+and Bi3+ions have similar ionic radii, the Bi1−xSrxMnO3system was found to show quite different behavior from La1−xSrxMnO3in which ferromagnetism with metallic conductivity is achieved by the “double exchange mechanism.” BiMnO3which was synthesized under high pressure is a ferromagnetic insulator withTc=105 K, in contrast to antiferromagnetic LaMnO3. Though Sr substitution in BiMnO3increased conductivity, no metallic state was achieved up to the solid solution limit ofx=0.67. Furthermore the saturation magnetic moment of 3.6μBobserved in BiMnO3decreased very rapidly with increasingx, and ferromagnetism disappeared forx>0.4. These observations suggest that the highly polarizable Bi3+ion with 6s2lone pair would cause local distortion of the perovskite lattice, which presumably reduces the mobility of carriers. The origin of ferromagnetism in BiMnO3requires a mechanism other than the double exchange theory.

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