Ronning, F; Hill, RW; Sutherland, M; Hawthorn, DG; Tanatar, MA; Paglione, J; Taillefer, L; ... Mackenzie, AP; + view all Ronning, F; Hill, RW; Sutherland, M; Hawthorn, DG; Tanatar, MA; Paglione, J; Taillefer, L; Graf, MJ; Perry, RS; Maeno, Y; Mackenzie, AP; - view fewer (2006) Thermal conductivity in the vicinity of the quantum critical end point in Sr3Ru2O7. Physical Review Letters , 97 (6) , Article 067005. 10.1103/PhysRevLett.97.067005.

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Abstract

Thermal conductivity of Sr 3 Ru 2 O 7 was measured down to 40 mK and at magnetic fields through the quantum critical end point at H c = 7.85     T . A peak in the electrical resistivity as a function of the field was mimicked by the thermal resistivity. In the limit as T → 0     K , we find that the Wiedemann-Franz law is satisfied to within 5% at all fields, implying that there is no breakdown of the electron despite the destruction of the Fermi liquid state at quantum criticality. A significant change in disorder [from ρ 0 ( H = 0     T ) = 2.1 to 0.5     μ Ω   cm ] does not influence our conclusions. At finite temperatures, the temperature dependence of the Lorenz number is consistent with ferromagnetic fluctuations causing the non-Fermi liquid behavior as one would expect at a metamagnetic quantum critical end point.

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