Giant electron-electron scattering in the Fermi-liquid state of Na_0.7CoO_2

Details Giant electron-electron scattering in the Fermi-liquid state of Na_0.7CoO_2 Giant electron-electron scattering in the Fermi-liquid state of Na_0.7CoO_2

2004-01-07

arxiv.org/abs/cond-mat/0401099v2

Phys. Rev. Lett. 93, 056401 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures; replaced with published version; added references and supporting data

Scientific paper

10.1103/PhysRevLett.93.056401

The in-plane resistivity, rho, and thermal conductivity, kappa, of a single crystal of Na_0.7CoO_2 were measured down to 40 mK. Verification of the Wiedemann-Franz law, kappa/T = L_0/rho as T -> 0, and observation of a T^2 dependence of rho at low temperature, rho = rho_0 + AT^2, establish the existence of a well-defined Fermi-liquid state. The measured value of coefficient A reveals enormous electron-electron scattering, characterized by the largest Kadowaki-Woods ratio, A/gamma^2, encountered in any material. The rapid suppression of A with magnetic field suggests a possible proximity to a magnetic quantum critical point. We also speculate on the possible role of magnetic frustration and proximity to a Mott insulator.

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