Abstract
The effect of lanthanum deficiency on structural, magnetic,transport, and electron magnetic resonance (EMR) properties hasbeen studied in a series of La1−xMnO3(x = 0.01,0.05, 0.11, 0.13) single crystals. The x-ray diffraction study resultsfor the crystals were found to be compatible with a single phase oforthorhombic symmetry. The magnetization curves exhibit weakferromagnetism for all samples below 138 K. It was found that both thespontaneous magnetization and the coercive field increase linearly withx.The pressure coefficient dTN/dP decreaseslinearly with self-doping, from a value of 0.68 K kbar−1 for La0.99MnO3to 0.33 K kbar−1 for La0.87MnO3.The resistivity of low-doped La0.99MnO3crystal is of semiconducting character, while that of La0.87MnO3depends weakly on temperature between 180 and 210 K. It was found that themagnetic and transport properties of the self-doped compounds may be attributedto a phase separation involving an antiferromagnetic matrix and ferromagneticclusters. The latter phases as well as their paramagnetic precursors have beendirectly observed by means of EMR.
Published Version
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