NMR relaxation and resistivity from rattling phonons in pyrochlore superconductors

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dc.creatorDahm, Thomas
dc.creatorUeda, Kazuo
dc.date2007-06-29
dc.date2007-09-17
dc.date.accessioned2026-07-07T08:39:00Z
dc.date.available2026-07-07T08:39:00Z
dc.descriptionWe calculate the temperature dependence of NMR relaxation rate and electrical resistivity for coupling to a local, strongly anharmonic phonon mode. We argue that the two-phonon Raman process is dominating NMR relaxation. Due to the strong anharmonicity of the phonon an unusual temperature dependence is found having a low temperature peak and becoming constant towards higher temperatures. The electrical resistivity is found to vary like T^2 at low temperatures and following a sqrt{T} behavior at high temperatures. Both results are in qualitative agreement with recent observations on beta-pyrochlore oxide superconductors.
dc.description4 pages, 4 figures; new version with some minor additional clarifications; accepted for publication in Phys. Rev. Lett
dc.identifierhttps://arxiv.org/abs/0706.4345
dc.identifierhttp://arxiv.org/abs/0706.4345
dc.identifierPhys. Rev. Lett. 99, 187003 (2007)
dc.identifierdoi:10.1103/PhysRevLett.99.187003
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/140931
dc.subjectSuperconductivity
dc.subjectMaterials Science
dc.titleNMR relaxation and resistivity from rattling phonons in pyrochlore superconductors
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