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dc.contributor.author
Massa, Nestor Emilio
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dc.contributor.author
Del Campo, Leire
dc.contributor.author
Holldack, Karsten
dc.contributor.author
Canizarès, Aurélien
dc.contributor.author
Ta Phuoc, Vinh
dc.contributor.author
Kayser, Paula
dc.contributor.author
Alonso, José Antonio
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dc.date.available
2023-09-13T15:02:48Z
dc.date.issued
2020-10
dc.identifier.citation
Massa, Nestor Emilio; Del Campo, Leire; Holldack, Karsten; Canizarès, Aurélien; Ta Phuoc, Vinh; et al.; H-ErMnO3 absorbance, reflectivity, and emissivity in the terahertz to mid-infrared from 2 to 1700 K: Carrier screening, Fröhlich resonance, small polarons, and bipolarons; American Physical Society; Physical Review B; 102; 13; 10-2020; 134305-134321
dc.identifier.issn
2469-9950
dc.identifier.uri
http://hdl.handle.net/11336/211372
dc.description.abstract
We report the temperature-dependent THz to mid-infrared response of hexagonal-ErMnO3 using absorption, reflectivity, and emissivity techniques from 2 to 1700 K. At low temperatures, lowest frequency vibrational modes, which extend up the lock-in ferroelectric temperature, coexist with paramagnon excitations and are associated with well-defined crystal-field rare-earth pure magnetic replicas in an intriguing phonon-magnetic convergence enhancing the multiferroic character of h-ErMnO3. Increasing the temperature, a number of vibrational bands close to the space group predicted undergo profile broadening and softening. In particular, a distinctive set of bands in the 288-329-cm-1 (300 K) range has a component whose profile is carrier screened becoming nearly fully blurred in the intermediate phase between ∼830 and ∼1500 K. Below TC∼830 K this asymmetric band, having one component still partially screened, further splits as spin phonon interaction and the tripling of the unit cell take place revealing at TN∼79 K a delicate balance of long- and short-range interactions. Ambient Raman scattering brings up evidence of a Fröhlich resonance due to Coulomb interactions between carriers and the macroscopic field linked to the corresponding longitudinal optical-phonon mode. We found it is dynamically correlated to the hexagonal c-axis negative thermal expansion. Quantitative analyses of the mid-infrared (MIR) optical conductivity show that it also plays a role in small polarons and mediates in high-temperature bipolarones. Bipolaron profiles at high temperatures change as the sample opacity increases when at ∼900 K straight stripes turn curly toward complex vortex-antivortex domain patterns in the paraelectric phase. At still higher temperatures a low-frequency Drude contribution is triggered by electron hopping signaling an insulator-metal phase transition at ∼1600 K while the MIR response suggests coexistence between single small polarons and bipolarons. On closing, we draw a parallel with improper ferroelectrics sustaining a lattice incommensurate intermediate phase and unit-cell tripling. We argue that in the h-RMnO3 (R=rare earth, Y) family of compounds the intermediate phase be considered incommensurate with onset at TINC∼1500 K and ferroelectric lock-in at TC∼830 K delimiting this regime in h-ErMnO3.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
American Physical Society
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dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
H-ErMnO3
dc.subject
ABSORBANCE, REFLECTIVITY, EMISSIVITY
dc.subject
TERAHERTZterahertz
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POLARONS
dc.subject.classification
Física de los Materiales Condensados
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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
H-ErMnO3 absorbance, reflectivity, and emissivity in the terahertz to mid-infrared from 2 to 1700 K: Carrier screening, Fröhlich resonance, small polarons, and bipolarons
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2023-09-12T18:09:00Z
dc.identifier.eissn
2469-9969
dc.journal.volume
102
dc.journal.number
13
dc.journal.pagination
134305-134321
dc.journal.pais
Estados Unidos
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dc.journal.ciudad
Maryland
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
dc.description.fil
Fil: Holldack, Karsten. Helmholtz-Zentrum für Materialien und Energie GmbH; Alemania
dc.description.fil
Fil: Canizarès, Aurélien. Université d Orléans; Francia
dc.description.fil
Fil: Ta Phuoc, Vinh. Universite de Tours; Francia
dc.description.fil
Fil: Kayser, Paula. University of Edinburgh; Reino Unido
dc.description.fil
Fil: Alonso, José Antonio. Instituto de Ciencia de Materiales de Madrid; España
dc.journal.title
Physical Review B
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://journals.aps.org/prb/abstract/10.1103/PhysRevB.102.134305
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1103/PhysRevB.102.134305
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