Jahn–Teller Ordering Dynamics in the Paraelectric BiMn7O12 Phase: 57Fe Probe Mössbauer Diagnostics.
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| Title: | Jahn–Teller Ordering Dynamics in the Paraelectric BiMn |
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| Authors: | Sobolev, A. V.1 (AUTHOR), Nitsenko, V. I.1 (AUTHOR), Belik, A. A.2 (AUTHOR), Glazkova, I. S.1 (AUTHOR) janglaz@bk.ru, Kondratyeva, M. S.3 (AUTHOR), Presniakov, I. A.1,3 (AUTHOR) |
| Source: | Journal of Experimental & Theoretical Physics. Sep2023, Vol. 137 Issue 3, p404-412. 9p. |
| Subjects: | Hyperfine interactions, Phase transitions, Jahn-Teller effect, Mössbauer spectroscopy, Dipole moments, Mössbauer effect |
| 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. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| 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. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 10637761 |
| DOI: | 10.1134/S1063776123090145 |
