NMR Relaxation and Resistivity from Rattling Phonons in Pyrochlore Superconductors

Thomas Dahm; Kazuo Ueda

doi:10.1103/PhysRevLett.99.187003

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NMR Relaxation and Resistivity from Rattling Phonons in Pyrochlore Superconductors

Thomas Dahm, Kazuo Ueda

DOI 10.1103/PhysRevLett.99.187003 · Physical Review Letters

T1

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Abstract

We calculate the temperature dependence of the 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 T2 at low temperatures and following a T behavior at high temperatures. Both results are in qualitative agreement with recent observations on β-pyrochlore oxide superconductors.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
KOs2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	9.6	Pressure not reported	unknown
RbOs2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
CsOs2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown