TY - JOUR
T1 - The Lorenz number in CeCoIn5 inferred from the thermal and charge Hall currents
AU - Onose, Y.
AU - Ong, N. P.
AU - Petrovic, C.
PY - 2007/11/1
Y1 - 2007/11/1
N2 - The thermal Hall conductivity κxy and Hall conductivity σxy in CeCoIn5 are used to determine the Lorenz number ℒH 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 σxy.
AB - The thermal Hall conductivity κxy and Hall conductivity σxy in CeCoIn5 are used to determine the Lorenz number ℒH 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 σxy.
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U2 - 10.1209/0295-5075/80/37005
DO - 10.1209/0295-5075/80/37005
M3 - Article
AN - SCOPUS:79051469997
SN - 0295-5075
VL - 80
JO - Journal de Physique (Paris), Lettres
JF - Journal de Physique (Paris), Lettres
IS - 3
M1 - 37005
ER -