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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
Martinez Lope, Maria Jesus
dc.contributor.author
Alonso, Jose Antonio
dc.date.available
2017-09-18T19:25:31Z
dc.date.issued
2013-08
dc.identifier.citation
Massa, Nestor Emilio; del Campo, Leire; de Sousa Meneses, Domingos; Echegut, Patrick; Martinez Lope, Maria Jesus; et al.; Paramagnetic collective electronic mode and low temperature hybrid modes in the
far infrared dynamics of orthorhombic NdMnO3; IOP Publishing; Journal of Physics: Condensed Matter; 25; 39; 8-2013; 395601-395610
dc.identifier.issn
0953-8984
dc.identifier.uri
http://hdl.handle.net/11336/24493
dc.description.abstract
We report on the far- and mid-infrared reflectivity of NdMnO3 from 4 to 300 K. Two main features are distinguished in the infrared spectra: active phonons in agreement with expectations for the orthorhombic ${\mathrm{D}}_{2\mathrm{h}}^{1 6}$–Pbnm (Z = 4) space group remaining constant down to 4 K and a well defined collective excitation in the THz region due to eg electrons in a d-orbital fluctuating environment. We trace its origin to the NdMnO3 high-temperature orbital disordered intermediate phase not being totally dynamically quenched at lower temperatures. This results in minute orbital misalignments that translate into randomized non-static eg electrons within orbitals yielding a room-temperature collective excitation. Below TN ~ 78 K, electrons gradually localize, inducing long-range magnetic order as the THz band condenses into two modes that emerge pinned to the A-type antiferromagnetic order. They harden simultaneously down to 4 K, obeying power laws with TN as the critical temperature and exponents β ~ 0.25 and β ~ 0.53, as for a tri-critical point and Landau magnetic ordering, respectively. At 4 K they match known zone center spin wave modes. The power law dependence is concomitant with a second order transition in which spin modes modulate orbital instabilities in a magnetoelectric hybridized orbital–charge–spin–lattice scenario. We also found that phonon profiles also undergo strong changes at TN ~ 78 K due to magnetoelasticity.
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
Collective Excitation
dc.subject
Far Infrared
dc.subject
Multierroics
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Spin Waves
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
Paramagnetic collective electronic mode and low temperature hybrid modes in the
far infrared dynamics of orthorhombic NdMnO3
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-09-14T13:53:33Z
dc.journal.volume
25
dc.journal.number
39
dc.journal.pagination
395601-395610
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. Universite d’Orléans; Francia
dc.description.fil
Fil: de Sousa Meneses, Domingos. Universite d’Orléans; Francia
dc.description.fil
Fil: Echegut, Patrick. Universite d’Orléans; Francia
dc.description.fil
Fil: Martinez 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/10.1088/0953-8984/25/39/395601
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.1088/0953-8984/25/39/395601/meta;
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