Metallic "Ferroelectricity" in the Pyrochlore Cd2Re2O7

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dc.creatorSergienko, I. A.
dc.creatorKeppens, V.
dc.creatorMcGuire, M.
dc.creatorJin, R.
dc.creatorHe, J.
dc.creatorCurnoe, S. H.
dc.creatorSales, B. C.
dc.creatorBlaha, P.
dc.creatorSingh, D. J.
dc.creatorSchwarz, K.
dc.creatorMandrus, D.
dc.date2004-02-05
dc.date.accessioned2026-07-07T02:56:20Z
dc.date.available2026-07-07T02:56:20Z
dc.descriptionA class of materials known as ``ferroelectric metals'' was discussed theoretically by Anderson and Blount in 1965 [Phys. Rev. Lett. 14, 217 (1965)], but to date no examples of this class have been reported. Here we present measurements of the elastic moduli of Cd2Re2O7 through the 200 K cubic-to-tetragonal phase transition. A Landau analysis of the moduli reveals that the transition is consistent with Cd2Re2O7 being classified as a ``ferroelectric metal'' in the weaker sense described by Anderson and Blount (loss of a center of symmetry). First-principles calculations of the lattice instabilities indicate that the dominant lattice instability corresponds to a two-fold degenerate mode with Eu symmetry, and that motions of the O ions forming the O octahedra dominate the energetics of the transition.
dc.description4 pages, 2 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0402171
dc.identifierhttp://arxiv.org/abs/cond-mat/0402171
dc.identifierPhys. Rev. Lett. 92, 065501 (2004)
dc.identifierdoi:10.1103/PhysRevLett.92.065501
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/23280
dc.subjectMaterials Science
dc.subjectStrongly Correlated Electrons
dc.titleMetallic "Ferroelectricity" in the Pyrochlore Cd2Re2O7
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