Thermopower and thermal conductivity of superconducting perovskite $MgCNi_3$

Details Thermopower and thermal conductivity of superconducting perovskite $MgCNi_3$ Thermopower and thermal conductivity of superconducting perovskite $MgCNi_3$

2001-07-17

arxiv.org/abs/cond-mat/0107352v2

Phys. Rev. B 65, 064534 (2002)

Physics

Condensed Matter

Superconductivity

Revised on 12 September 2001, Phys. Rev. B in press

Scientific paper

10.1103/PhysRevB.65.064534

The thermopower and thermal conductivity of superconducting perovskite $MgCNi_3$ ($T_c \approx$ 8 K) have been studied. The thermopower is negative from room temperature to 10 K. Combining with the negative Hall coefficient reported previously, the negative thermopower definetly indicates that the carrier in $MgCNi_3$ is electron-type. The nonlinear temperature dependence of thermopower below 150 K is explained by the electron-phonon interaction renormalization effects. The thermal conductivity is of the order for intermetallics, larger than that of borocarbides and smaller than $MgB_2$. In the normal state, the electronic contribution to the total thermal conductivity is slightly larger than the lattice contribution. The transverse magnetoresistance of $MgCNi_3$ is also measured. It is found that the classical Kohler's rule is valid above 50 K. An electronic crossover occures at $T^* \sim 50 K$, resulting in the abnormal behavior of resistivity, thermopower, and magnetoresistance below 50 K.

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