High temperature far-infrared dynamics of orthorhombic NdMnO₃: emissivity and reflectivity
- Autores
- Massa, Néstor Emilio; Campo, Leire del; De Sousa Meneses, Domingos; Echegut, Patrick; Martínez-Lope, María Jesús; Alonso, José Antonio
- Año de publicación
- 2013
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- We report on near normal far- and mid-infrared emission and reflectivity of NdMnO₃ perovskite from room temperature to sample decomposition above 1800 K. At 300 K the number infrared active phonons is in close agreement with the 25 calculated for the orthorhombic D¹⁶2h-Pbnm (Z=4) space group. Their number gradually decreases as we approach the temperature of orbital disorder at ~1023 K where the orthorhombic O' lower temperature cooperative phase coexists with the cubic orthorhombic O. At above ~1200 K, the three infrared active phonons coincide with the expected for cubic Pm-3m (Z=1) in the high temperature insulating regime. Heating samples in dry air triggers double exchange conductivity by Mn³⁺ and Mn⁴⁺ ions and a small polaron mid-infrared band. Fits to the optical conductivity single out the octahedral antisymmetric and symmetric vibrational modes as main phonons in the electron-phonon interactions at 875 K. For 1745 K, it is enough to consider the symmetric stretching internal mode. An overdamped defect induced Drude component is clearly outlined at the highest temperatures. We conclude that Rare Earth manganites eg electrons are prone to spin, charge, orbital, and lattice couplings in an intrinsic orbital distorted perovskite lattice favoring embryonic low energy collective excitations.
Facultad de Ciencias Exactas
Centro de Química Inorgánica - Materia
-
Ciencias Exactas
Física
Química
infrared emission
reflectivity
emissivity - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- http://creativecommons.org/licenses/by-nc-sa/4.0/
- Repositorio
- Institución
- Universidad Nacional de La Plata
- OAI Identificador
- oai:sedici.unlp.edu.ar:10915/131374
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High temperature far-infrared dynamics of orthorhombic NdMnO₃: emissivity and reflectivityMassa, Néstor EmilioCampo, Leire delDe Sousa Meneses, DomingosEchegut, PatrickMartínez-Lope, María JesúsAlonso, José AntonioCiencias ExactasFísicaQuímicainfrared emissionreflectivityemissivityWe report on near normal far- and mid-infrared emission and reflectivity of NdMnO₃ perovskite from room temperature to sample decomposition above 1800 K. At 300 K the number infrared active phonons is in close agreement with the 25 calculated for the orthorhombic D¹⁶<sub>2h</sub>-Pbnm (Z=4) space group. Their number gradually decreases as we approach the temperature of orbital disorder at ~1023 K where the orthorhombic O' lower temperature cooperative phase coexists with the cubic orthorhombic O. At above ~1200 K, the three infrared active phonons coincide with the expected for cubic Pm-3m (Z=1) in the high temperature insulating regime. Heating samples in dry air triggers double exchange conductivity by Mn³⁺ and Mn⁴⁺ ions and a small polaron mid-infrared band. Fits to the optical conductivity single out the octahedral antisymmetric and symmetric vibrational modes as main phonons in the electron-phonon interactions at 875 K. For 1745 K, it is enough to consider the symmetric stretching internal mode. An overdamped defect induced Drude component is clearly outlined at the highest temperatures. We conclude that Rare Earth manganites e<sub>g</sub> electrons are prone to spin, charge, orbital, and lattice couplings in an intrinsic orbital distorted perovskite lattice favoring embryonic low energy collective excitations.Facultad de Ciencias ExactasCentro de Química Inorgánica2013-05info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttp://sedici.unlp.edu.ar/handle/10915/131374enginfo:eu-repo/semantics/altIdentifier/issn/1361-648Xinfo:eu-repo/semantics/altIdentifier/issn/0953-8984info:eu-repo/semantics/altIdentifier/arxiv/1309.1482info:eu-repo/semantics/altIdentifier/pmid/23676242info:eu-repo/semantics/altIdentifier/doi/10.1088/0953-8984/25/23/235603info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:31:13Zoai:sedici.unlp.edu.ar:10915/131374Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:31:13.837SEDICI (UNLP) - Universidad Nacional de La Platafalse |
dc.title.none.fl_str_mv |
High temperature far-infrared dynamics of orthorhombic NdMnO₃: emissivity and reflectivity |
title |
High temperature far-infrared dynamics of orthorhombic NdMnO₃: emissivity and reflectivity |
spellingShingle |
High temperature far-infrared dynamics of orthorhombic NdMnO₃: emissivity and reflectivity Massa, Néstor Emilio Ciencias Exactas Física Química infrared emission reflectivity emissivity |
title_short |
High temperature far-infrared dynamics of orthorhombic NdMnO₃: emissivity and reflectivity |
title_full |
High temperature far-infrared dynamics of orthorhombic NdMnO₃: emissivity and reflectivity |
title_fullStr |
High temperature far-infrared dynamics of orthorhombic NdMnO₃: emissivity and reflectivity |
title_full_unstemmed |
High temperature far-infrared dynamics of orthorhombic NdMnO₃: emissivity and reflectivity |
title_sort |
High temperature far-infrared dynamics of orthorhombic NdMnO₃: emissivity and reflectivity |
dc.creator.none.fl_str_mv |
Massa, Néstor Emilio Campo, Leire del De Sousa Meneses, Domingos Echegut, Patrick Martínez-Lope, María Jesús Alonso, José Antonio |
author |
Massa, Néstor Emilio |
author_facet |
Massa, Néstor Emilio Campo, Leire del De Sousa Meneses, Domingos Echegut, Patrick Martínez-Lope, María Jesús Alonso, José Antonio |
author_role |
author |
author2 |
Campo, Leire del De Sousa Meneses, Domingos Echegut, Patrick Martínez-Lope, María Jesús Alonso, José Antonio |
author2_role |
author author author author author |
dc.subject.none.fl_str_mv |
Ciencias Exactas Física Química infrared emission reflectivity emissivity |
topic |
Ciencias Exactas Física Química infrared emission reflectivity emissivity |
dc.description.none.fl_txt_mv |
We report on near normal far- and mid-infrared emission and reflectivity of NdMnO₃ perovskite from room temperature to sample decomposition above 1800 K. At 300 K the number infrared active phonons is in close agreement with the 25 calculated for the orthorhombic D¹⁶<sub>2h</sub>-Pbnm (Z=4) space group. Their number gradually decreases as we approach the temperature of orbital disorder at ~1023 K where the orthorhombic O' lower temperature cooperative phase coexists with the cubic orthorhombic O. At above ~1200 K, the three infrared active phonons coincide with the expected for cubic Pm-3m (Z=1) in the high temperature insulating regime. Heating samples in dry air triggers double exchange conductivity by Mn³⁺ and Mn⁴⁺ ions and a small polaron mid-infrared band. Fits to the optical conductivity single out the octahedral antisymmetric and symmetric vibrational modes as main phonons in the electron-phonon interactions at 875 K. For 1745 K, it is enough to consider the symmetric stretching internal mode. An overdamped defect induced Drude component is clearly outlined at the highest temperatures. We conclude that Rare Earth manganites e<sub>g</sub> electrons are prone to spin, charge, orbital, and lattice couplings in an intrinsic orbital distorted perovskite lattice favoring embryonic low energy collective excitations. Facultad de Ciencias Exactas Centro de Química Inorgánica |
description |
We report on near normal far- and mid-infrared emission and reflectivity of NdMnO₃ perovskite from room temperature to sample decomposition above 1800 K. At 300 K the number infrared active phonons is in close agreement with the 25 calculated for the orthorhombic D¹⁶<sub>2h</sub>-Pbnm (Z=4) space group. Their number gradually decreases as we approach the temperature of orbital disorder at ~1023 K where the orthorhombic O' lower temperature cooperative phase coexists with the cubic orthorhombic O. At above ~1200 K, the three infrared active phonons coincide with the expected for cubic Pm-3m (Z=1) in the high temperature insulating regime. Heating samples in dry air triggers double exchange conductivity by Mn³⁺ and Mn⁴⁺ ions and a small polaron mid-infrared band. Fits to the optical conductivity single out the octahedral antisymmetric and symmetric vibrational modes as main phonons in the electron-phonon interactions at 875 K. For 1745 K, it is enough to consider the symmetric stretching internal mode. An overdamped defect induced Drude component is clearly outlined at the highest temperatures. We conclude that Rare Earth manganites e<sub>g</sub> electrons are prone to spin, charge, orbital, and lattice couplings in an intrinsic orbital distorted perovskite lattice favoring embryonic low energy collective excitations. |
publishDate |
2013 |
dc.date.none.fl_str_mv |
2013-05 |
dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Articulo http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
format |
article |
status_str |
publishedVersion |
dc.identifier.none.fl_str_mv |
http://sedici.unlp.edu.ar/handle/10915/131374 |
url |
http://sedici.unlp.edu.ar/handle/10915/131374 |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/issn/1361-648X info:eu-repo/semantics/altIdentifier/issn/0953-8984 info:eu-repo/semantics/altIdentifier/arxiv/1309.1482 info:eu-repo/semantics/altIdentifier/pmid/23676242 info:eu-repo/semantics/altIdentifier/doi/10.1088/0953-8984/25/23/235603 |
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openAccess |
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http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) |
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