Ferromagnetism in the (Bi, Sr)MnO3 Solid Solution Synthesized under High Pressure
Open Access
- 1 January 1998
- journal article
- Published by The Magnetics Society of Japan in Journal of the Magnetics Society of Japan
- Vol. 22 (S_1_ISFA_9), S1_52-54
- https://doi.org/10.3379/jmsjmag.22.s1_52
Abstract
BiMnO3 synthesized at high pressure is a triclinically distorted perovskite and a ferromagnetic insulator with Tc = 105 K, in contrast to antiferromagnetic LaMnO3. Though the conductivity of Bi1-xSrxMnO3 increased with x, no metallic state was achieved to the solid solution limit of x = 0.67. Furthetmore saturation magnetic moment of 3.6 μB observed in BiMnO3 decreased very rapidly with increasing x, and ferromagnetism disappeared for x > 0.4. These observations suggest that the highly polarizable Bi3+ ion with 6s2 lone pair would cause local distortion of the perovskite lattice, which presumably reduces the mobility of carriers. The ferromagnetism in BiMnO3 cannot be compatible with the double exchange mechanism, but is probably related to the orbital ordering of manganese ions in the perovskite lattice. The ferromagnetic moment of Bi1-xCaxMnO3 appeared in Ca-rich composition of 0.825 < x < 0.95, showing maximum value of 1.1 μB per a Mn atom at x = 0.875. The electrical resistivity remarkably decreases with the Bi substitution, but never shows metallic behavior. The ferromagnetism achieved by electron doping seems to be suppressed by charge ordering with further doping.Keywords
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