Impact of temperature-dependent local and global spin order in RMnO3 compounds for spin–phonon coupling and electromagnon activity
The orthorhombic rare-earth manganite compounds R MnO _3 show a global magnetic order for $T\lt {T}_{N}$ , and several representatives are multiferroic with a cycloidal spin ground state order for $T\lt {T}_{{\rm{cycl}}}\lt {T}_{N}\approx 40\,{\rm{K}}$ . We deduce from the temperature dependence of...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2017-01-01
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| Series: | New Journal of Physics |
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| Online Access: | https://doi.org/10.1088/1367-2630/aa55ed |
| _version_ | 1797750934422421504 |
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| author | S Elsässer M Schiebl A A Mukhin A M Balbashov A Pimenov J Geurts |
| author_facet | S Elsässer M Schiebl A A Mukhin A M Balbashov A Pimenov J Geurts |
| author_sort | S Elsässer |
| collection | DOAJ |
| description | The orthorhombic rare-earth manganite compounds R MnO _3 show a global magnetic order for $T\lt {T}_{N}$ , and several representatives are multiferroic with a cycloidal spin ground state order for $T\lt {T}_{{\rm{cycl}}}\lt {T}_{N}\approx 40\,{\rm{K}}$ . We deduce from the temperature dependence of spin–phonon coupling in Raman spectroscopy for a series of R MnO _3 compounds that their spin order locally persists up to about twice T _N . Along the same line, our observation of the persistence of the electromagnon in GdMnO _3 up to $T\approx 100\,{\rm{K}}$ is attributed to a local cycloidal spin order for $T\gt {T}_{{\rm{cycl}}}$ , in contrast to the hitherto assumed incommensurate sinusoidal phase in the intermediate temperature range. The development of the magnetization pattern can be described in terms of an order–disorder transition at T _cycl within a pseudospin model of localized spin cycloids with opposite chirality. |
| first_indexed | 2024-03-12T16:40:02Z |
| format | Article |
| id | doaj.art-f55f108518014bfa83c9ce7cb0d41426 |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:40:02Z |
| publishDate | 2017-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-f55f108518014bfa83c9ce7cb0d414262023-08-08T14:34:31ZengIOP PublishingNew Journal of Physics1367-26302017-01-0119101300510.1088/1367-2630/aa55edImpact of temperature-dependent local and global spin order in RMnO3 compounds for spin–phonon coupling and electromagnon activityS Elsässer0M Schiebl1A A Mukhin2A M Balbashov3A Pimenov4J Geurts5Physikalisches Institut (EP3), Universität Würzburg , D-97074 Würzburg, GermanyInstitute of Solid State Physics, Vienna University of Technology , A-1040 Vienna, AustriaProkhorov General Physics Institute , Russian Academy of Sciences, 119991 Moscow, RussiaMoscow Power Engineering Institute (Technical University) , ul. Krasnokazarmennaya 14, Moscow 111250, RussiaInstitute of Solid State Physics, Vienna University of Technology , A-1040 Vienna, AustriaPhysikalisches Institut (EP3), Universität Würzburg , D-97074 Würzburg, GermanyThe orthorhombic rare-earth manganite compounds R MnO _3 show a global magnetic order for $T\lt {T}_{N}$ , and several representatives are multiferroic with a cycloidal spin ground state order for $T\lt {T}_{{\rm{cycl}}}\lt {T}_{N}\approx 40\,{\rm{K}}$ . We deduce from the temperature dependence of spin–phonon coupling in Raman spectroscopy for a series of R MnO _3 compounds that their spin order locally persists up to about twice T _N . Along the same line, our observation of the persistence of the electromagnon in GdMnO _3 up to $T\approx 100\,{\rm{K}}$ is attributed to a local cycloidal spin order for $T\gt {T}_{{\rm{cycl}}}$ , in contrast to the hitherto assumed incommensurate sinusoidal phase in the intermediate temperature range. The development of the magnetization pattern can be described in terms of an order–disorder transition at T _cycl within a pseudospin model of localized spin cycloids with opposite chirality.https://doi.org/10.1088/1367-2630/aa55edRMnO3multiferroicselectromagnonRaman spectroscopyspin–phonon coupling |
| spellingShingle | S Elsässer M Schiebl A A Mukhin A M Balbashov A Pimenov J Geurts Impact of temperature-dependent local and global spin order in RMnO3 compounds for spin–phonon coupling and electromagnon activity New Journal of Physics RMnO3 multiferroics electromagnon Raman spectroscopy spin–phonon coupling |
| title | Impact of temperature-dependent local and global spin order in RMnO3 compounds for spin–phonon coupling and electromagnon activity |
| title_full | Impact of temperature-dependent local and global spin order in RMnO3 compounds for spin–phonon coupling and electromagnon activity |
| title_fullStr | Impact of temperature-dependent local and global spin order in RMnO3 compounds for spin–phonon coupling and electromagnon activity |
| title_full_unstemmed | Impact of temperature-dependent local and global spin order in RMnO3 compounds for spin–phonon coupling and electromagnon activity |
| title_short | Impact of temperature-dependent local and global spin order in RMnO3 compounds for spin–phonon coupling and electromagnon activity |
| title_sort | impact of temperature dependent local and global spin order in rmno3 compounds for spin phonon coupling and electromagnon activity |
| topic | RMnO3 multiferroics electromagnon Raman spectroscopy spin–phonon coupling |
| url | https://doi.org/10.1088/1367-2630/aa55ed |
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