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
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/131374
Acceder
id SEDICI_8a9b423792406a25867c46218ab9f0fe
oai_identifier_str oai:sedici.unlp.edu.ar:10915/131374
network_acronym_str SEDICI
repository_id_str 1329
network_name_str SEDICI (UNLP)
spelling 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:UNLP2025-10-22T17:12:07Zoai: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:13292025-10-22 17:12:07.854SEDICI (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
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
instname:Universidad Nacional de La Plata
instacron:UNLP
reponame_str SEDICI (UNLP)
collection SEDICI (UNLP)
instname_str Universidad Nacional de La Plata
instacron_str UNLP
institution UNLP
repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
repository.mail.fl_str_mv alira@sedici.unlp.edu.ar
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score 12.982451

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