Abstract
Thermal conductivity has been measured from 0.03 K to 0.8 K in single crystal CeNi 2 Ge 2 which is quite near the quantum critical point (QCP). The Wiedemann–Franz law is observed at low temperatures (T<0.1 K) for both directions (j⊥c and j ∥ c), indicating that quasiparticles are scattered elastically as T→0 K. With increasing temperature, a deviation from the Wiedemann–Franz law due to inelastic spin-fluctuation contributions is observed. The effect of proximity to the QCP in CeNi 2 Ge 2 appears in the spin-fluctuation contributions to the thermal and electrical conductivities.
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Kambe, S., Suderow, H., Fukuhara, T. et al. Spin-Fluctuation Mediated Thermal Conductivity Around the Magnetic Instability of CeNi2Ge2 . Journal of Low Temperature Physics 117, 101–112 (1999). https://doi.org/10.1023/A:1021865906745
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DOI: https://doi.org/10.1023/A:1021865906745