Temperature and Magnetic Field Dependence of the Coexistent Phases in La<sub>1-<i>x</i></sub>Ca<sub><i>x</i></sub>MnO<sub>3+δ</sub>(<i>x</i>=0.47, 0.49)

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  • Temperature and Magnetic Field Dependence of the Coexistent Phases in La1-xCaxMnO3+.DELTA. (x=0.47,0.49)

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X-ray diffraction measurements under high and low temperature, and magnetic field have been performed for the doped La1−xCaxMnO3+δ polycrystals to clarify the coexistent phases and their structures around the composition of x∼0.5. By measurements at high temperature, the transition from a Pnma to an Imma space group symmetry phase has been firstly observed in this system at the temperature between 500°C and 600°C. At low temperature, the importance of the measurement of (131) reflection is noticed and the phase fraction of two similar Pnma phases with ferromagnetic and anti-ferromagnetic states is determined. It is found that the application of the magnetic field by 5 T and the slight change of the composition x by 0.02 remarkably affect this phase fraction.

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