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
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/24963
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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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1846782489618546688 |
score |
12.982451 |