Phonons and hybrid modes in the high and low temperature far infrared dynamics of hexagonal TmMnO3

Autores
Massa, Nestor Emilio; del Campo, Leire; De Sousa Meneses, Domingos; Echegut, Patrick; Martínez Lope, Maria Jesus; Alonso, Jose Antonio
Año de publicación
2014
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We report on temperature dependent TmMnO3 far infrared emissivity and reflectivity spectra from 1910K to 4K. At the highest temperature the number of infrared bands is lower than that predicted for centrosymmetric P63/mmc ( ) D6h 4 (Z = 2) space group due to high temperature anharmonicity and possible defect induced bitetrahedra misalignments. On cooling, at ~1600±40K, TmMnO3 goes from non-polar to an antiferroelectric–ferroelectric polar phase reaching the ferroelectric onset at ~700K. Room temperature reflectivity is fitted using 19 oscillators and this number of phonons is maintained down to 4K. A weak phonon anomaly in the band profile at 217 cm−1 (4K) suggests subtle Rare Earth magneto-electric couplings at ~TN and below. A low energy collective excitation is identified as a THz instability associated with room temperature eg electrons in a d-orbital fluctuating environment. It condenses into two modes that emerge pinned to the E-type antiferromagnetic order hardening simultaneously down to 4K. They obey power laws with TN as the critical temperature and match known zone center magnons. The one peaking at 26 cm−1, with critical exponent β=0.42 as for antiferromagnetic order in a hexagonal lattice, is dependent on the Rare Earth ion. The higher frequency companion at ~50 cm−1, with β=0.25, splits at ~TN into two peaks. The weaker band of the two is assimilated to the upper branch of the gap opening in the transverse acoustical (TA) phonon branch crossing the magnetic dispersion found in YMnO3. (Petit et al 2007 Phys. Rev. Lett. 99 266604). The stronger second band at ~36 cm−1 corresponds to the lower branch of the TA gap. We assign both excitations as zone center magneto-electric hybrid quasiparticles, concluding that in NdMnO3 perovskite the equivalent picture corresponds to an instability which may be driven by an external field to transform NdMnO3 into a multiferroic compound by perturbation enhancing the TA phonon–magnetic correlation.
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: De Sousa Meneses, Domingos. Université d’Orléans; Francia
Fil: Echegut, Patrick. Université d’Orléans; Francia
Fil: Martínez Lope, Maria Jesus. Instituto de Ciencia de Materiales de Madrid; España
Fil: Alonso, Jose Antonio. Instituto de Ciencia de Materiales de Madrid; España
Materia
Tmmno3
Phase Transition Ferroelectric
Magnetoelectric Effects
Multiferroics
Far Infrared Reflectivity
Far Infrared Emissivity
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:11336/24963

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oai_identifier_str oai:ri.conicet.gov.ar:11336/24963
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Phonons and hybrid modes in the high and low temperature far infrared dynamics of hexagonal TmMnO3Massa, Nestor Emiliodel Campo, LeireDe Sousa Meneses, DomingosEchegut, PatrickMartínez Lope, Maria JesusAlonso, Jose AntonioTmmno3Phase Transition FerroelectricMagnetoelectric EffectsMultiferroicsFar Infrared ReflectivityFar Infrared Emissivityhttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1We report on temperature dependent TmMnO3 far infrared emissivity and reflectivity spectra from 1910K to 4K. At the highest temperature the number of infrared bands is lower than that predicted for centrosymmetric P63/mmc ( ) D6h 4 (Z = 2) space group due to high temperature anharmonicity and possible defect induced bitetrahedra misalignments. On cooling, at ~1600±40K, TmMnO3 goes from non-polar to an antiferroelectric–ferroelectric polar phase reaching the ferroelectric onset at ~700K. Room temperature reflectivity is fitted using 19 oscillators and this number of phonons is maintained down to 4K. A weak phonon anomaly in the band profile at 217 cm−1 (4K) suggests subtle Rare Earth magneto-electric couplings at ~TN and below. A low energy collective excitation is identified as a THz instability associated with room temperature eg electrons in a d-orbital fluctuating environment. It condenses into two modes that emerge pinned to the E-type antiferromagnetic order hardening simultaneously down to 4K. They obey power laws with TN as the critical temperature and match known zone center magnons. The one peaking at 26 cm−1, with critical exponent β=0.42 as for antiferromagnetic order in a hexagonal lattice, is dependent on the Rare Earth ion. The higher frequency companion at ~50 cm−1, with β=0.25, splits at ~TN into two peaks. The weaker band of the two is assimilated to the upper branch of the gap opening in the transverse acoustical (TA) phonon branch crossing the magnetic dispersion found in YMnO3. (Petit et al 2007 Phys. Rev. Lett. 99 266604). The stronger second band at ~36 cm−1 corresponds to the lower branch of the TA gap. We assign both excitations as zone center magneto-electric hybrid quasiparticles, concluding that in NdMnO3 perovskite the equivalent picture corresponds to an instability which may be driven by an external field to transform NdMnO3 into a multiferroic compound by perturbation enhancing the TA phonon–magnetic correlation.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: De Sousa Meneses, Domingos. Université d’Orléans; FranciaFil: Echegut, Patrick. Université d’Orléans; FranciaFil: Martínez Lope, Maria Jesus. Instituto de Ciencia de Materiales de Madrid; EspañaFil: Alonso, Jose Antonio. Instituto de Ciencia de Materiales de Madrid; EspañaIOP Publishing2014-06info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/24963Massa, Nestor Emilio; del Campo, Leire; De Sousa Meneses, Domingos; Echegut, Patrick; Martínez Lope, Maria Jesus; et al.; Phonons and hybrid modes in the high and low temperature far infrared dynamics of hexagonal TmMnO3; IOP Publishing; Journal of Physics: Condensed Matter; 26; 6-2014; 275901-2759110953-8984CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1088/0953-8984/26/27/275901info:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.1088/0953-8984/26/27/275901/meta;info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-22T12:10:25Zoai:ri.conicet.gov.ar:11336/24963instacron: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:34982025-10-22 12:10:26.181CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Phonons and hybrid modes in the high and low temperature far infrared dynamics of hexagonal TmMnO3
title Phonons and hybrid modes in the high and low temperature far infrared dynamics of hexagonal TmMnO3
spellingShingle Phonons and hybrid modes in the high and low temperature far infrared dynamics of hexagonal TmMnO3
Massa, Nestor Emilio
Tmmno3
Phase Transition Ferroelectric
Magnetoelectric Effects
Multiferroics
Far Infrared Reflectivity
Far Infrared Emissivity
title_short Phonons and hybrid modes in the high and low temperature far infrared dynamics of hexagonal TmMnO3
title_full Phonons and hybrid modes in the high and low temperature far infrared dynamics of hexagonal TmMnO3
title_fullStr Phonons and hybrid modes in the high and low temperature far infrared dynamics of hexagonal TmMnO3
title_full_unstemmed Phonons and hybrid modes in the high and low temperature far infrared dynamics of hexagonal TmMnO3
title_sort Phonons and hybrid modes in the high and low temperature far infrared dynamics of hexagonal TmMnO3
dc.creator.none.fl_str_mv Massa, Nestor Emilio
del Campo, Leire
De Sousa Meneses, Domingos
Echegut, Patrick
Martínez Lope, Maria Jesus
Alonso, Jose Antonio
author Massa, Nestor Emilio
author_facet Massa, Nestor Emilio
del Campo, Leire
De Sousa Meneses, Domingos
Echegut, Patrick
Martínez Lope, Maria Jesus
Alonso, Jose Antonio
author_role author
author2 del Campo, Leire
De Sousa Meneses, Domingos
Echegut, Patrick
Martínez Lope, Maria Jesus
Alonso, Jose Antonio
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Tmmno3
Phase Transition Ferroelectric
Magnetoelectric Effects
Multiferroics
Far Infrared Reflectivity
Far Infrared Emissivity
topic Tmmno3
Phase Transition Ferroelectric
Magnetoelectric Effects
Multiferroics
Far Infrared Reflectivity
Far Infrared Emissivity
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 temperature dependent TmMnO3 far infrared emissivity and reflectivity spectra from 1910K to 4K. At the highest temperature the number of infrared bands is lower than that predicted for centrosymmetric P63/mmc ( ) D6h 4 (Z = 2) space group due to high temperature anharmonicity and possible defect induced bitetrahedra misalignments. On cooling, at ~1600±40K, TmMnO3 goes from non-polar to an antiferroelectric–ferroelectric polar phase reaching the ferroelectric onset at ~700K. Room temperature reflectivity is fitted using 19 oscillators and this number of phonons is maintained down to 4K. A weak phonon anomaly in the band profile at 217 cm−1 (4K) suggests subtle Rare Earth magneto-electric couplings at ~TN and below. A low energy collective excitation is identified as a THz instability associated with room temperature eg electrons in a d-orbital fluctuating environment. It condenses into two modes that emerge pinned to the E-type antiferromagnetic order hardening simultaneously down to 4K. They obey power laws with TN as the critical temperature and match known zone center magnons. The one peaking at 26 cm−1, with critical exponent β=0.42 as for antiferromagnetic order in a hexagonal lattice, is dependent on the Rare Earth ion. The higher frequency companion at ~50 cm−1, with β=0.25, splits at ~TN into two peaks. The weaker band of the two is assimilated to the upper branch of the gap opening in the transverse acoustical (TA) phonon branch crossing the magnetic dispersion found in YMnO3. (Petit et al 2007 Phys. Rev. Lett. 99 266604). The stronger second band at ~36 cm−1 corresponds to the lower branch of the TA gap. We assign both excitations as zone center magneto-electric hybrid quasiparticles, concluding that in NdMnO3 perovskite the equivalent picture corresponds to an instability which may be driven by an external field to transform NdMnO3 into a multiferroic compound by perturbation enhancing the TA phonon–magnetic correlation.
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: De Sousa Meneses, Domingos. Université d’Orléans; Francia
Fil: Echegut, Patrick. Université d’Orléans; Francia
Fil: Martínez Lope, Maria Jesus. Instituto de Ciencia de Materiales de Madrid; España
Fil: Alonso, Jose Antonio. Instituto de Ciencia de Materiales de Madrid; España
description We report on temperature dependent TmMnO3 far infrared emissivity and reflectivity spectra from 1910K to 4K. At the highest temperature the number of infrared bands is lower than that predicted for centrosymmetric P63/mmc ( ) D6h 4 (Z = 2) space group due to high temperature anharmonicity and possible defect induced bitetrahedra misalignments. On cooling, at ~1600±40K, TmMnO3 goes from non-polar to an antiferroelectric–ferroelectric polar phase reaching the ferroelectric onset at ~700K. Room temperature reflectivity is fitted using 19 oscillators and this number of phonons is maintained down to 4K. A weak phonon anomaly in the band profile at 217 cm−1 (4K) suggests subtle Rare Earth magneto-electric couplings at ~TN and below. A low energy collective excitation is identified as a THz instability associated with room temperature eg electrons in a d-orbital fluctuating environment. It condenses into two modes that emerge pinned to the E-type antiferromagnetic order hardening simultaneously down to 4K. They obey power laws with TN as the critical temperature and match known zone center magnons. The one peaking at 26 cm−1, with critical exponent β=0.42 as for antiferromagnetic order in a hexagonal lattice, is dependent on the Rare Earth ion. The higher frequency companion at ~50 cm−1, with β=0.25, splits at ~TN into two peaks. The weaker band of the two is assimilated to the upper branch of the gap opening in the transverse acoustical (TA) phonon branch crossing the magnetic dispersion found in YMnO3. (Petit et al 2007 Phys. Rev. Lett. 99 266604). The stronger second band at ~36 cm−1 corresponds to the lower branch of the TA gap. We assign both excitations as zone center magneto-electric hybrid quasiparticles, concluding that in NdMnO3 perovskite the equivalent picture corresponds to an instability which may be driven by an external field to transform NdMnO3 into a multiferroic compound by perturbation enhancing the TA phonon–magnetic correlation.
publishDate 2014
dc.date.none.fl_str_mv 2014-06
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/11336/24963
Massa, Nestor Emilio; del Campo, Leire; De Sousa Meneses, Domingos; Echegut, Patrick; Martínez Lope, Maria Jesus; et al.; Phonons and hybrid modes in the high and low temperature far infrared dynamics of hexagonal TmMnO3; IOP Publishing; Journal of Physics: Condensed Matter; 26; 6-2014; 275901-275911
0953-8984
CONICET Digital
CONICET
url http://hdl.handle.net/11336/24963
identifier_str_mv Massa, Nestor Emilio; del Campo, Leire; De Sousa Meneses, Domingos; Echegut, Patrick; Martínez Lope, Maria Jesus; et al.; Phonons and hybrid modes in the high and low temperature far infrared dynamics of hexagonal TmMnO3; IOP Publishing; Journal of Physics: Condensed Matter; 26; 6-2014; 275901-275911
0953-8984
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1088/0953-8984/26/27/275901
info:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.1088/0953-8984/26/27/275901/meta;
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 IOP Publishing
publisher.none.fl_str_mv IOP Publishing
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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score 12.982451