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Heat and charge conduction were measured in the heavy-fermion metal CeRhIn5,an antiferromagnet with T_N=3.8 K. The thermal resistivity is found to beproportional to the magnetic entropy, revealing that spin fluctuations are aseffective in scattering electrons as they are in disordering local moments. Theelectrical resistivity, governed by a q^2 weighting of fluctuations, increasesmonotonically with temperature. In contrast, the difference between thermal andelectrical resistivities, characterized by an omega^2 weighting, peaks sharplyat T_N and eventually goes to zero at a temperature T^* ~ 8 K. T^* thus emergesas a measure of the characteristic energy of magnetic fluctuations.Comment: 4 pages, 4 figure

physical review letters

Heat Transport as a Probe of Electron Scattering by Spin Fluctuations: The Case of Antiferromagnetic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>CeRhIn</mml:mi><mml:mn>5</mml:mn></mml:msub></mml:math>

Heat Transport as a Probe of Electron Scattering by Spin Fluctuations: The Case of AntiferromagneticCeRhIn5