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dc.contributor.author
Massa, Nestor Emilio
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dc.contributor.author
del Campo, Leire
dc.contributor.author
De Sousa Meneses, Domingos
dc.contributor.author
Echegut, Patrick
dc.contributor.author
Martínez Lope, Maria Jesus
dc.contributor.author
Alonso, Jose Antonio
dc.date.available
2017-09-22T18:46:15Z
dc.date.issued
2014-06
dc.identifier.citation
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
dc.identifier.issn
0953-8984
dc.identifier.uri
http://hdl.handle.net/11336/24963
dc.description.abstract
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.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
IOP Publishing
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Tmmno3
dc.subject
Phase Transition Ferroelectric
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Magnetoelectric Effects
dc.subject
Multiferroics
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Far Infrared Reflectivity
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Far Infrared Emissivity
dc.subject.classification
Otras Ciencias Físicas
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dc.subject.classification
Ciencias Físicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Phonons and hybrid modes in the high and low temperature far infrared dynamics of hexagonal TmMnO3
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-09-18T14:29:30Z
dc.journal.volume
26
dc.journal.pagination
275901-275911
dc.journal.pais
Reino Unido
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dc.journal.ciudad
Londres
dc.description.fil
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
dc.description.fil
Fil: del Campo, Leire. Université d’Orléans; Francia
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Fil: De Sousa Meneses, Domingos. Université d’Orléans; Francia
dc.description.fil
Fil: Echegut, Patrick. Université d’Orléans; Francia
dc.description.fil
Fil: Martínez Lope, Maria Jesus. Instituto de Ciencia de Materiales de Madrid; España
dc.description.fil
Fil: Alonso, Jose Antonio. Instituto de Ciencia de Materiales de Madrid; España
dc.journal.title
Journal of Physics: Condensed Matter
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1088/0953-8984/26/27/275901
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.1088/0953-8984/26/27/275901/meta;
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