Jahn-Teller Ordering Dynamics in the Paraelectric BiMn.sub.7O.sub.12 Phase: .sup.57Fe Probe Mössbauer Diagnostics
The electrical hyperfine interactions of the .sup.57Fe probe nuclei stabilized in the structure of the BiMn.sub.7O.sub.12 manganite are studied by Mössbauer spectroscopy. Mössbauer spectra are measured in the para-electric temperature range, which includes the structural phase transitions I2/m â Im...
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| Veröffentlicht in: | Journal of experimental and theoretical physics 2023-09, Vol.137 (3), p.404 |
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| container_title | Journal of experimental and theoretical physics |
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| creator | Sobolev, A. V Nitsenko, V. I Belik, A. A Glazkova, I. S Kondratyeva, M. S Presniakov, I. A |
| description | The electrical hyperfine interactions of the .sup.57Fe probe nuclei stabilized in the structure of the BiMn.sub.7O.sub.12 manganite are studied by Mössbauer spectroscopy. Mössbauer spectra are measured in the para-electric temperature range, which includes the structural phase transitions I2/m â Im [Formula omitted] (T.sub.1 [almost equal to] 600 K) and Im â I2/m (T.sub.2 [almost equal to] 450 K). The calculation of the parameters of the electric field gradient tensor with allowance for the dipole contributions of Bi.sup.3+ cations in the range of the first phase transition allowed us to confirm a random orientation of the dipole moments p.sub.Bi in the cubic phase of the manganite (Im [Formula omitted]). Based on an analysis of the Mössbauer spectra recorded at T.sub.2 < T < T.sub.1, 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. |
| doi_str_mv | 10.1134/S1063776123090145 |
| format | Article |
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V ; Nitsenko, V. I ; Belik, A. A ; Glazkova, I. S ; Kondratyeva, M. S ; Presniakov, I. A</creator><creatorcontrib>Sobolev, A. V ; Nitsenko, V. I ; Belik, A. A ; Glazkova, I. S ; Kondratyeva, M. S ; Presniakov, I. A</creatorcontrib><description>The electrical hyperfine interactions of the .sup.57Fe probe nuclei stabilized in the structure of the BiMn.sub.7O.sub.12 manganite are studied by Mössbauer spectroscopy. Mössbauer spectra are measured in the para-electric temperature range, which includes the structural phase transitions I2/m â Im [Formula omitted] (T.sub.1 [almost equal to] 600 K) and Im â I2/m (T.sub.2 [almost equal to] 450 K). The calculation of the parameters of the electric field gradient tensor with allowance for the dipole contributions of Bi.sup.3+ cations in the range of the first phase transition allowed us to confirm a random orientation of the dipole moments p.sub.Bi in the cubic phase of the manganite (Im [Formula omitted]). Based on an analysis of the Mössbauer spectra recorded at T.sub.2 < T < T.sub.1, 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.</description><identifier>ISSN: 1063-7761</identifier><identifier>DOI: 10.1134/S1063776123090145</identifier><language>eng</language><publisher>Springer</publisher><subject>Electric fields</subject><ispartof>Journal of experimental and theoretical physics, 2023-09, Vol.137 (3), p.404</ispartof><rights>COPYRIGHT 2023 Springer</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,27903,27904</link.rule.ids></links><search><creatorcontrib>Sobolev, A. 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The calculation of the parameters of the electric field gradient tensor with allowance for the dipole contributions of Bi.sup.3+ cations in the range of the first phase transition allowed us to confirm a random orientation of the dipole moments p.sub.Bi in the cubic phase of the manganite (Im [Formula omitted]). 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A</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Jahn-Teller Ordering Dynamics in the Paraelectric BiMn.sub.7O.sub.12 Phase: .sup.57Fe Probe Mössbauer Diagnostics</atitle><jtitle>Journal of experimental and theoretical physics</jtitle><date>2023-09-01</date><risdate>2023</risdate><volume>137</volume><issue>3</issue><spage>404</spage><pages>404-</pages><issn>1063-7761</issn><abstract>The electrical hyperfine interactions of the .sup.57Fe probe nuclei stabilized in the structure of the BiMn.sub.7O.sub.12 manganite are studied by Mössbauer spectroscopy. Mössbauer spectra are measured in the para-electric temperature range, which includes the structural phase transitions I2/m â Im [Formula omitted] (T.sub.1 [almost equal to] 600 K) and Im â I2/m (T.sub.2 [almost equal to] 450 K). The calculation of the parameters of the electric field gradient tensor with allowance for the dipole contributions of Bi.sup.3+ cations in the range of the first phase transition allowed us to confirm a random orientation of the dipole moments p.sub.Bi in the cubic phase of the manganite (Im [Formula omitted]). Based on an analysis of the Mössbauer spectra recorded at T.sub.2 < T < T.sub.1, 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><pub>Springer</pub><doi>10.1134/S1063776123090145</doi><tpages>9</tpages></addata></record> |
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| title | Jahn-Teller Ordering Dynamics in the Paraelectric BiMn.sub.7O.sub.12 Phase: .sup.57Fe Probe Mössbauer Diagnostics |
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