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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 BiMn7O12 Phase: 57Fe Probe Mössbauer Diagnostics.
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]
Copyright of Journal of Experimental & Theoretical Physics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: The electrical hyperfine interactions of the 57Fe probe nuclei stabilized in the structure of the BiMn7O12 manganite are studied by M&#246;ssbauer spectroscopy. M&#246;ssbauer 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 M&#246;ssbauer spectra recorded at T2 &lt; T &lt; T1, we considered various scenarios for the manifestation of the dynamic Jahn–Teller effect, which leads to the &quot;melting&quot; of the orbital order in the manganese sublattice, in terms of a two-level relaxation model. [ABSTRACT FROM AUTHOR]
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  Data: &lt;i&gt;Copyright of Journal of Experimental &amp; Theoretical Physics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
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        Value: 10.1134/S1063776123090145
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        Type: general
      – SubjectFull: Phase transitions
        Type: general
      – SubjectFull: Jahn-Teller effect
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      – SubjectFull: Mössbauer spectroscopy
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      – TitleFull: Jahn–Teller Ordering Dynamics in the Paraelectric BiMn7O12 Phase: 57Fe Probe Mössbauer Diagnostics.
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              Text: Sep2023
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