NMR relaxation and resistivity from rattling phonons in pyrochlore superconductors

Details NMR relaxation and resistivity from rattling phonons in pyrochlore superconductors NMR relaxation and resistivity from rattling phonons in pyrochlore superconductors

2007-06-29

arxiv.org/abs/0706.4345v2

Phys. Rev. Lett. 99, 187003 (2007)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures; new version with some minor additional clarifications; accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.99.187003

We 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.

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