Quantum paraelectric behavior of pyrochlore PMN

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dc.creatorKamba, S.
dc.creatorNuzhnyy, D.
dc.creatorDenisov, S.
dc.creatorVeljko, S.
dc.creatorBovtun, V.
dc.creatorSavinov, M.
dc.creatorPetzelt, J.
dc.creatorKalnberga, M.
dc.creatorSternberg, A.
dc.date2007-03-06
dc.date2007-07-12
dc.date.accessioned2026-07-07T08:31:54Z
dc.date.available2026-07-07T08:31:54Z
dc.descriptionPb_1.83Mg_0.29Nb_1.71O_6.39 (PMN) crystallizing in a cubic pyrochlore structure exhibits, as the first dielectrics with pyrochlore structure, typical feature of quantum paraelectrics - its permittivity continuously increases on cooling and levels off below ~ 30K, without any signature of a structural phase transition. Broad-band dielectric spectra do not show any dielectric dispersion in the real part of permittivity up to 8.8 GHz. THz and infrared spectra reveal a soft polar optic mode which is responsible for the temperature dependence of the permittivity. The leveling-off of the permittivity at low temperatures obeys the Barrett formula and the fitted vibrational zero-point energy 1/(2*k_B*T_1) corresponds to the measured soft mode frequency. The number of observed infrared phonons exceeds that predicted from the factor-group analysis which indicates that the structure is at least locally non-cubic.
dc.descriptionsubm. to PRB, revised version according to referees' reports
dc.identifierhttps://arxiv.org/abs/cond-mat/0703159
dc.identifierhttp://arxiv.org/abs/cond-mat/0703159
dc.identifierPhys. Rev. B 76, 054125 (2007)
dc.identifierdoi:10.1103/PhysRevB.76.054125
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/138641
dc.subjectMaterials Science
dc.titleQuantum paraelectric behavior of pyrochlore PMN
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