Optical phonon modes and infrared dielectric properties of monoclinic CoWO4 microcrystals

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dc.creatorRoberto Luiz Moreira
dc.creatorRafael Mendonça Almeida
dc.creatorKisla Prislen Felix Siqueira
dc.creatorCíntia Grossi de Abreu
dc.creatorAnderson Dias
dc.date.accessioned2023-07-28T14:10:43Z
dc.date.accessioned2025-09-08T23:47:59Z
dc.date.available2023-07-28T14:10:43Z
dc.date.issued2016
dc.description.sponsorshipCNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico
dc.description.sponsorshipFAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas Gerais
dc.description.sponsorshipCAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
dc.description.sponsorshipOutra Agência
dc.identifier.doihttps://dx.doi.org/10.1088/0022-3727/49/4/045305
dc.identifier.issn0022-3727
dc.identifier.urihttps://hdl.handle.net/1843/57129
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofJournal of Physics D: Applied Physics
dc.rightsAcesso Restrito
dc.subjectFonons
dc.subjectDispositivos dielétricos
dc.subjectEspectroscopia de infravermelho
dc.subjectCristais
dc.subjectRaman, Efeito de
dc.subject.otherPhonons
dc.subject.otherDielectric properties
dc.subject.otherInfrared spectroscopy
dc.subject.otherMonoclinic crystals
dc.subject.otherMultiferroics
dc.subject.otherRaman scattering
dc.titleOptical phonon modes and infrared dielectric properties of monoclinic CoWO4 microcrystals
dc.typeArtigo de periódico
local.citation.issue4
local.citation.spage045305
local.citation.volume49
local.description.resumoThe phonon characteristics of CoWO4 microcrystals with monoclinic Wolframite structure were investigated by far-infrared (IR) and Raman spectroscopies. Near-normal spectra were taken for IR light polarization along the principal b-axis (Au modes) and along several angles within the ac-plane (Bu modes). The IR spectra were analyzed with a generalized Drude–Lorentz model, and all predicted polar phonon modes were fully determined, including their symmetries, the dielectric Lorentz parameters and the non-orthogonal phonon polarizations for the Bu modes. Anomalous dispersion and negative values for the real and imaginary parts of the off-diagonal components of the dielectric tensor functions were identified and discussed under the light of the varying phonon polarization directions (spread out in the ac-plane). The obtained static and background dielectric tensors gave an average permittivity of 16.1 (at microwave region), refractive indices along the principal dielectric axes of 2.22, 2.33 and 2.44 (at 1 μm), the optical axes, and an estimated value for the biaxial angle of the crystal. Polarized Raman spectra on appropriate scattering configurations revealed the 18 non-polar gerade phonons of CoWO4 crystals, with their correct symmetries attributed.
local.identifier.orcidhttps://orcid.org/0000-0001-7413-1087
local.identifier.orcidhttps://orcid.org/0000-0001-6820-0269
local.identifier.orcidhttps://orcid.org/0000-0002-8039-6425
local.identifier.orcidhttps://orcid.org/0000-0002-6344-3103
local.publisher.countryBrasil
local.publisher.departmentICX - DEPARTAMENTO DE FÍSICA
local.publisher.departmentICX - DEPARTAMENTO DE QUÍMICA
local.publisher.initialsUFMG
local.url.externahttps://iopscience.iop.org/article/10.1088/0022-3727/49/4/045305

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