Abstract
Hyperfine interactions in the Bi1−xLaxFeO3 ferrites (where x = 0.0225, 0.075, 0.9) have been studied by means of 57Fe Mössbauer spectroscopy and 140Ce time differential perturbed angular γ–γ correlation methods. The information about the line shift δ, the lattice εlat and the magnetic εmag contributions to the quadrupole shift ε, isotropic His and anisotropic Han contributions to the hyperfine magnetic field Hhf on 57Fe nuclei, anharmonicity parameter m, distribution of the hyperfine magnetic field p(Hhf), and supertransferred hyperfine magnetic fields on 140Ce probe nuclei were obtained. In all studied compounds, the Fe ions are in a high-spin trivalent state. In the compounds with x = 0.0225 and 0.075 spatially modulated cycloidal magnetic structures exist. It was found that the sign of the effective constant of magnetic anisotropy Keff changes with the variation of x from 0.0225 to 0.075. The substitution of Bi by La increases the value of the hyperfine magnetic field on 57Fe nuclei from 494 kOe in Bi0.9775La0.0225FeO3 to 520 kOe in Bi0.1La0.9FeO3, i.e. by 26 kOe, while the corresponding supertransferred hyperfine magnetic field on 140Ce probe nuclei decreases.
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Acknowledgements
This work was supported by the Russian Foundation for Basic Research (Grant No. 20-02-00795a) and the Ministry of Education (Grant No. FSFZ-0706-2020-0022). We are grateful for the support in developing a digital TDPAC spectrometer to the Polish representative at the Joint Institute for Nuclear Research.
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This article is part of the Topical Collection on Proceedings of the International Conference on Hyperfine Interactions (HYPERFINE 2021), 5-10 September 2021, Brasov, Romania
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Pokatilov, V.S., Salamatin, D.A., Bokov, A.V. et al. Hyperfine interactions in the Bi1−xLaxFeO3 ferrites (x = 0.0225, 0.075, 0.9). Hyperfine Interact 242, 33 (2021). https://doi.org/10.1007/s10751-021-01749-z
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DOI: https://doi.org/10.1007/s10751-021-01749-z