Abstract
The electrical hyperfine interactions of the 57Fe probe nuclei stabilized in the structure of the BiMn7O12 manganite are studied by Mössbauer spectroscopy. Mössbauer spectra are measured in the para-electric temperature range, which includes the structural phase transitions I2/m ↔ Im\(\bar {3}\) (T1 ≈ 600 K) and Im ↔ I2/m (T2 ≈ 450 K). The calculation of the parameters of the electric field gradient tensor with allowance for the dipole contributions of Bi3+ cations in the range of the first phase transition allowed us to confirm a random orientation of the dipole moments pBi in the cubic phase of the manganite (Im\(\bar {3}\)). Based on an analysis of the Mössbauer spectra recorded at T2 < T < T1, we considered various scenarios for the manifestation of the dynamic Jahn–Teller effect, which leads to the “melting” of the orbital order in the manganese sublattice, in terms of a two-level relaxation model.
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This work was supported by the Russian Science Foundation, project no. 19-73-10034.
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Translated by K. Shakhlevich
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Sobolev, A.V., Nitsenko, V.I., Belik, A.A. et al. Jahn–Teller Ordering Dynamics in the Paraelectric BiMn7O12 Phase: 57Fe Probe Mössbauer Diagnostics. J. Exp. Theor. Phys. 137, 404–412 (2023). https://doi.org/10.1134/S1063776123090145
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DOI: https://doi.org/10.1134/S1063776123090145