Goldstone-Mode Phonon Dynamics in the Pyrochlore Cd2Re2O7

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dc.creatorKendziora, C. A.
dc.creatorSergienko, I. A.
dc.creatorJin, R.
dc.creatorHe, J.
dc.creatorKeppens, V.
dc.creatorSales, B. C.
dc.creatorMandrus, D.
dc.date2005-03-31
dc.date2005-08-03
dc.date.accessioned2026-07-07T03:04:23Z
dc.date.available2026-07-07T03:04:23Z
dc.descriptionWe have measured the polarized Raman scattering spectra of Cd2Re2O7, the first superconducting pyrochlore, as a function of temperature. For temperatures below the cubic-to-tetragonal structural phase transition (SPT) at 200K, a peak with B1 symmetry develops at zero frequency with divergent intensity. We identify this peak as the first observation of the Goldstone phonon in a crystalline solid. The Goldstone phonon is a collective excitation that exists due to the breaking of the continuous symmetry with the SPT. Its emergence coincides with that of a Raman-active soft mode. The order parameter for both features derives from an unstable doubly-degenerate vibration (with Eu symmetry) of the O1 atoms which drives the SPT.
dc.description4+ pages, 4 figures. Updated figures and text. Accepted to PRL
dc.identifierhttps://arxiv.org/abs/cond-mat/0503756
dc.identifierhttp://arxiv.org/abs/cond-mat/0503756
dc.identifierPhys. Rev. Lett. 95, 125503 (2005)
dc.identifierdoi:10.1103/PhysRevLett.95.125503
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/26115
dc.subjectMaterials Science
dc.subjectSuperconductivity
dc.titleGoldstone-Mode Phonon Dynamics in the Pyrochlore Cd2Re2O7
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