由热霍尔电流和电荷霍尔电流推知CeCoIn $_5$中的Lorenz数
The Lorenz number in CeCoIn$_5$ inferred from the thermal and charge Hall currents
摘要：
利用CeCoIn $_5$中的霍尔热导率$κ_{xy}$和霍尔电导率$σ_{xy}$来确定低温下的洛伦兹数${\cal L}_H$ $T$。这使得能够将观察到的热导率分为其电子和非电子部分。我们发现的证据电荷中性，场依赖性的热导率，我们确定与自旋激发。在低$T$下，这些激发支配载流子的散射。我们发现，在高场的自旋激发的抑制导致急剧增强的电子平均自由程，这导致了一个有趣的磁电阻，热导率和$σ_{xy}$之间的标度关系。
英文摘要：
The thermal Hall conductivity $κ_{xy}$ and Hall conductivity $σ_{xy}$ in CeCoIn$_5$ are used to determine the Lorenz number ${\cal L}_H$ 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 $σ_{xy}$.
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