Far- and mid-infrared emission and reflectivity of orthorhombic and cubic ErMn O3: Polarons and bipolarons

Autores
Massa, Nestor Emilio; Del Campo, Leire; Holldack, Karsten; Ta Phuoc, Vinh; Echegut, Patrick; Kayser, Paula; Alonso, José Antonio
Año de publicación
2018
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We report on the high-temperature evolution of far- and mid-infrared reflectivity and emissivity spectra of ambient orthorhombic ErMnO3 from 12 K to sample decomposition above 1800 K. At low temperatures the number of phonons agrees with the predictions for orthorhombic space group D2h16-Pbnm (Z=4) and coexists with a paramagnon spin resonance and rare-earth crystal-field transitions. Increasing the temperature, a number of vibrational bands undergo profile broadening and softening approaching the orbital disordered phase where the orthorhombic Ó lower-temperature cooperative phase coexists with cubic-orthorhombic O. O-ErMnO3 undergoes a first-order order-disorder transition into the perovskite cubic phase at Tcubic∼1329K±20K where the three triple degenerate phonons allowed by the space group Pm-3m (Z=1) are identified. At about 800 K, a quantitative small polaron analysis of the orthorhombic midinfrared real part optical conductivity shows that antisymmetric and symmetric breathing modes sustain the strongest electron-phonon interactions. Above Tcubic the bipolaron fingerprint profile is the midinfrared dominant and only feature. Its appearance correlates with the localized screening of the highest vibrational mode reststrahlen band. We propose that the longitudinal optical mode macroscopic field screening is a consequence of dynamically sharing δ disproportioned eg electrons hovering over the Jahn-Teller distorted octahedral dimer {Mn(QJT)3+δ[Mn(QJT)[3]-δ]O6/2}2. A thermal driven insulator-metal transition is detected with onset ∼1600 K. We also address the occurrence of an inhomogeneity induced terahertz band result of heating the samples in dry air, triggering Mn3+-Mn4+ double exchange, under the presence of Mn4+ smaller ions stabilizing the orthorhombic lattice.
Fil: Massa, Nestor Emilio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Química Inorgánica "Dr. Pedro J. Aymonino". Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Centro de Química Inorgánica "Dr. Pedro J. Aymonino"; Argentina
Fil: Del Campo, Leire. Université d Orléans; Francia
Fil: Holldack, Karsten. Institut für Methoden und Instrumentierung der Forschung mit Synchrotronstrahlung; Alemania
Fil: Ta Phuoc, Vinh. Universite de Tours; Francia
Fil: Echegut, Patrick. Centre National de la Recherche Scientifique; Francia
Fil: Kayser, Paula. University of Edinburgh; Reino Unido
Fil: Alonso, José Antonio. Instituto de Ciencia de Materiales de Madrid; España
Materia
CUBIC ErMnO3
JAHN-TELLER
LATTICE DYNAMICS
POLARONS
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/210781

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oai_identifier_str oai:ri.conicet.gov.ar:11336/210781
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Far- and mid-infrared emission and reflectivity of orthorhombic and cubic ErMn O3: Polarons and bipolaronsMassa, Nestor EmilioDel Campo, LeireHolldack, KarstenTa Phuoc, VinhEchegut, PatrickKayser, PaulaAlonso, José AntonioCUBIC ErMnO3JAHN-TELLERLATTICE DYNAMICSPOLARONShttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1We report on the high-temperature evolution of far- and mid-infrared reflectivity and emissivity spectra of ambient orthorhombic ErMnO3 from 12 K to sample decomposition above 1800 K. At low temperatures the number of phonons agrees with the predictions for orthorhombic space group D2h16-Pbnm (Z=4) and coexists with a paramagnon spin resonance and rare-earth crystal-field transitions. Increasing the temperature, a number of vibrational bands undergo profile broadening and softening approaching the orbital disordered phase where the orthorhombic Ó lower-temperature cooperative phase coexists with cubic-orthorhombic O. O-ErMnO3 undergoes a first-order order-disorder transition into the perovskite cubic phase at Tcubic∼1329K±20K where the three triple degenerate phonons allowed by the space group Pm-3m (Z=1) are identified. At about 800 K, a quantitative small polaron analysis of the orthorhombic midinfrared real part optical conductivity shows that antisymmetric and symmetric breathing modes sustain the strongest electron-phonon interactions. Above Tcubic the bipolaron fingerprint profile is the midinfrared dominant and only feature. Its appearance correlates with the localized screening of the highest vibrational mode reststrahlen band. We propose that the longitudinal optical mode macroscopic field screening is a consequence of dynamically sharing δ disproportioned eg electrons hovering over the Jahn-Teller distorted octahedral dimer {Mn(QJT)3+δ[Mn(QJT)[3]-δ]O6/2}2. A thermal driven insulator-metal transition is detected with onset ∼1600 K. We also address the occurrence of an inhomogeneity induced terahertz band result of heating the samples in dry air, triggering Mn3+-Mn4+ double exchange, under the presence of Mn4+ smaller ions stabilizing the orthorhombic lattice.Fil: Massa, Nestor Emilio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Química Inorgánica "Dr. Pedro J. Aymonino". Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Centro de Química Inorgánica "Dr. Pedro J. Aymonino"; ArgentinaFil: Del Campo, Leire. Université d Orléans; FranciaFil: Holldack, Karsten. Institut für Methoden und Instrumentierung der Forschung mit Synchrotronstrahlung; AlemaniaFil: Ta Phuoc, Vinh. Universite de Tours; FranciaFil: Echegut, Patrick. Centre National de la Recherche Scientifique; FranciaFil: Kayser, Paula. University of Edinburgh; Reino UnidoFil: Alonso, José Antonio. Instituto de Ciencia de Materiales de Madrid; EspañaAmerican Physical Society2018-11info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/210781Massa, Nestor Emilio; Del Campo, Leire; Holldack, Karsten; Ta Phuoc, Vinh; Echegut, Patrick; et al.; Far- and mid-infrared emission and reflectivity of orthorhombic and cubic ErMn O3: Polarons and bipolarons; American Physical Society; Physical Review B; 98; 18; 11-2018; 184302-1843152469-99502469-9969CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1103/PhysRevB.98.184302info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:49:11Zoai:ri.conicet.gov.ar:11336/210781instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 09:49:12.103CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Far- and mid-infrared emission and reflectivity of orthorhombic and cubic ErMn O3: Polarons and bipolarons
title Far- and mid-infrared emission and reflectivity of orthorhombic and cubic ErMn O3: Polarons and bipolarons
spellingShingle Far- and mid-infrared emission and reflectivity of orthorhombic and cubic ErMn O3: Polarons and bipolarons
Massa, Nestor Emilio
CUBIC ErMnO3
JAHN-TELLER
LATTICE DYNAMICS
POLARONS
title_short Far- and mid-infrared emission and reflectivity of orthorhombic and cubic ErMn O3: Polarons and bipolarons
title_full Far- and mid-infrared emission and reflectivity of orthorhombic and cubic ErMn O3: Polarons and bipolarons
title_fullStr Far- and mid-infrared emission and reflectivity of orthorhombic and cubic ErMn O3: Polarons and bipolarons
title_full_unstemmed Far- and mid-infrared emission and reflectivity of orthorhombic and cubic ErMn O3: Polarons and bipolarons
title_sort Far- and mid-infrared emission and reflectivity of orthorhombic and cubic ErMn O3: Polarons and bipolarons
dc.creator.none.fl_str_mv Massa, Nestor Emilio
Del Campo, Leire
Holldack, Karsten
Ta Phuoc, Vinh
Echegut, Patrick
Kayser, Paula
Alonso, José Antonio
author Massa, Nestor Emilio
author_facet Massa, Nestor Emilio
Del Campo, Leire
Holldack, Karsten
Ta Phuoc, Vinh
Echegut, Patrick
Kayser, Paula
Alonso, José Antonio
author_role author
author2 Del Campo, Leire
Holldack, Karsten
Ta Phuoc, Vinh
Echegut, Patrick
Kayser, Paula
Alonso, José Antonio
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv CUBIC ErMnO3
JAHN-TELLER
LATTICE DYNAMICS
POLARONS
topic CUBIC ErMnO3
JAHN-TELLER
LATTICE DYNAMICS
POLARONS
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv We report on the high-temperature evolution of far- and mid-infrared reflectivity and emissivity spectra of ambient orthorhombic ErMnO3 from 12 K to sample decomposition above 1800 K. At low temperatures the number of phonons agrees with the predictions for orthorhombic space group D2h16-Pbnm (Z=4) and coexists with a paramagnon spin resonance and rare-earth crystal-field transitions. Increasing the temperature, a number of vibrational bands undergo profile broadening and softening approaching the orbital disordered phase where the orthorhombic Ó lower-temperature cooperative phase coexists with cubic-orthorhombic O. O-ErMnO3 undergoes a first-order order-disorder transition into the perovskite cubic phase at Tcubic∼1329K±20K where the three triple degenerate phonons allowed by the space group Pm-3m (Z=1) are identified. At about 800 K, a quantitative small polaron analysis of the orthorhombic midinfrared real part optical conductivity shows that antisymmetric and symmetric breathing modes sustain the strongest electron-phonon interactions. Above Tcubic the bipolaron fingerprint profile is the midinfrared dominant and only feature. Its appearance correlates with the localized screening of the highest vibrational mode reststrahlen band. We propose that the longitudinal optical mode macroscopic field screening is a consequence of dynamically sharing δ disproportioned eg electrons hovering over the Jahn-Teller distorted octahedral dimer {Mn(QJT)3+δ[Mn(QJT)[3]-δ]O6/2}2. A thermal driven insulator-metal transition is detected with onset ∼1600 K. We also address the occurrence of an inhomogeneity induced terahertz band result of heating the samples in dry air, triggering Mn3+-Mn4+ double exchange, under the presence of Mn4+ smaller ions stabilizing the orthorhombic lattice.
Fil: Massa, Nestor Emilio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Química Inorgánica "Dr. Pedro J. Aymonino". Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Centro de Química Inorgánica "Dr. Pedro J. Aymonino"; Argentina
Fil: Del Campo, Leire. Université d Orléans; Francia
Fil: Holldack, Karsten. Institut für Methoden und Instrumentierung der Forschung mit Synchrotronstrahlung; Alemania
Fil: Ta Phuoc, Vinh. Universite de Tours; Francia
Fil: Echegut, Patrick. Centre National de la Recherche Scientifique; Francia
Fil: Kayser, Paula. University of Edinburgh; Reino Unido
Fil: Alonso, José Antonio. Instituto de Ciencia de Materiales de Madrid; España
description We report on the high-temperature evolution of far- and mid-infrared reflectivity and emissivity spectra of ambient orthorhombic ErMnO3 from 12 K to sample decomposition above 1800 K. At low temperatures the number of phonons agrees with the predictions for orthorhombic space group D2h16-Pbnm (Z=4) and coexists with a paramagnon spin resonance and rare-earth crystal-field transitions. Increasing the temperature, a number of vibrational bands undergo profile broadening and softening approaching the orbital disordered phase where the orthorhombic Ó lower-temperature cooperative phase coexists with cubic-orthorhombic O. O-ErMnO3 undergoes a first-order order-disorder transition into the perovskite cubic phase at Tcubic∼1329K±20K where the three triple degenerate phonons allowed by the space group Pm-3m (Z=1) are identified. At about 800 K, a quantitative small polaron analysis of the orthorhombic midinfrared real part optical conductivity shows that antisymmetric and symmetric breathing modes sustain the strongest electron-phonon interactions. Above Tcubic the bipolaron fingerprint profile is the midinfrared dominant and only feature. Its appearance correlates with the localized screening of the highest vibrational mode reststrahlen band. We propose that the longitudinal optical mode macroscopic field screening is a consequence of dynamically sharing δ disproportioned eg electrons hovering over the Jahn-Teller distorted octahedral dimer {Mn(QJT)3+δ[Mn(QJT)[3]-δ]O6/2}2. A thermal driven insulator-metal transition is detected with onset ∼1600 K. We also address the occurrence of an inhomogeneity induced terahertz band result of heating the samples in dry air, triggering Mn3+-Mn4+ double exchange, under the presence of Mn4+ smaller ions stabilizing the orthorhombic lattice.
publishDate 2018
dc.date.none.fl_str_mv 2018-11
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
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://hdl.handle.net/11336/210781
Massa, Nestor Emilio; Del Campo, Leire; Holldack, Karsten; Ta Phuoc, Vinh; Echegut, Patrick; et al.; Far- and mid-infrared emission and reflectivity of orthorhombic and cubic ErMn O3: Polarons and bipolarons; American Physical Society; Physical Review B; 98; 18; 11-2018; 184302-184315
2469-9950
2469-9969
CONICET Digital
CONICET
url http://hdl.handle.net/11336/210781
identifier_str_mv Massa, Nestor Emilio; Del Campo, Leire; Holldack, Karsten; Ta Phuoc, Vinh; Echegut, Patrick; et al.; Far- and mid-infrared emission and reflectivity of orthorhombic and cubic ErMn O3: Polarons and bipolarons; American Physical Society; Physical Review B; 98; 18; 11-2018; 184302-184315
2469-9950
2469-9969
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1103/PhysRevB.98.184302
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv American Physical Society
publisher.none.fl_str_mv American Physical Society
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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