Abstract
Fe doping effect on the local magnetic property of La0.7Ca0.3Mn1−xFexO3 (0.4 ≤ x ≤ 0.55) was investigated by means of 57Fe Mössbauer spectroscopy. The X-ray diffraction patterns and the isomer shifts of the 57Fe Mössbauer spectra demonstrate that all the Fe ions are high-spin trivalent and share the B site lattice positions with Mn ions. The sample of La0.7Ca0.3Mn0.6Fe0.4O3 (x = 0.4) was found to be in the paramagnetic state even at 8 K. For the samples with high Fe contents, however, magnetic sextet(s) arising from local magnetic ordering were observed in the low-temperature spectrum of La0.7Ca0.3Mn0.5Fe0.5O3 (x = 0.5), and also in all the spectra of La0.7Ca0.3Mn0.45Fe0.55O3 (x = 0.55) measured in the range of 8 K—room temperature. These observations suggest that randomly distributed Fe3+ ions interfere with the double exchange interaction in Mn3+–O–Mn4+, and antiferromagnetic ordering arises from superexchange interaction in Fe3+–O–Fe3+ at high Fe content.
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Acknowledgements
The authors are grateful to Professor Yoshio Kobayashi of The University of Electro-Communications for his technical advice in the Mössbauer measurements. The present work was supported in part by JSPS KAKENHI Grants No. 26286075, 18H03692, and 22K12661.
Funding
W. Sato was supported by JSPS KAKENHI Grants No. 26286075, 18H03692, and 22K12661.
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Sato, W., Uchino, H. & Takanashi, K. Variation of local magnetism in a perovskite manganite La0.7Ca0.3MnO3 by Fe doping. Hyperfine Interact 244, 17 (2023). https://doi.org/10.1007/s10751-023-01832-7
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DOI: https://doi.org/10.1007/s10751-023-01832-7