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- Title
Jahn–Teller Ordering Dynamics in the Paraelectric BiMn<sub>7</sub>O<sub>12</sub> Phase: <sup>57</sup>Fe Probe Mössbauer Diagnostics.
- Authors
Sobolev, A. V.; Nitsenko, V. I.; Belik, A. A.; Glazkova, I. S.; Kondratyeva, M. S.; Presniakov, I. A.
- 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 (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 ). 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.
- Subjects
HYPERFINE interactions; PHASE transitions; JAHN-Teller effect; MOSSBAUER spectroscopy; DIPOLE moments; MOSSBAUER effect
- Publication
Journal of Experimental & Theoretical Physics, 2023, Vol 137, Issue 3, p404
- ISSN
1063-7761
- Publication type
Article
- DOI
10.1134/S1063776123090145