Volume 80, Number 3, November 2007
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||28 September 2007|
The Lorenz number in CeCoIn5 inferred from the thermal and charge Hall currents
Department of Physics, Princeton University - Princeton, NJ 08544, USA
2 Department of Physics, Brookhaven National Laboratory - Upton, NY 11973, USA
Accepted: 5 September 2007
The thermal Hall conductivity and Hall conductivity in CeCoIn5 are used to determine the Lorenz number at low temperature T. This enables the separation of the observed thermal conductivity into its electronic and non-electronic parts. We uncover evidence for a charge-neutral, field-dependent thermal conductivity, which we identify with spin excitations. At low T, these excitations dominate the scattering of charge carriers. We show that suppression of the spin excitations in high fields leads to a steep enhancement of the electron mean-free-path, which leads to an interesting scaling relation between the magnetoresistance, thermal conductivity and .
PACS: 71.27.+a – Strongly correlated electron systems; heavy fermions / 72.15.Eb – Electrical and thermal conduction in crystalline metals and alloys / 72.20.My – Galvanomagnetic and other magnetotransport effects
© Europhysics Letters Association, 2007
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