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The normal state resistivtity, upper critical field $H_{c2}$ and Hallcoefficient $R_H$ in superconducting perovskite $MgCNi_3$ ($T_c \approx 8 K$)have been studied. Above 70 K, $\rho(T)$ fits well curve predicted byBloch-Gr\"{u}neisen theory consistently with electron-phonon scattering.$H_{c2}(0)$ was estimated to be about 15.0 Tesla within the weak-coupling BCStheory, and the superconducting coherence length $\xi(0)$ is approximately 47\AA. $R_H$ of $MgCNi_3$ is negative for the whole temperature range whichdefinitely indicates that the carrier in $MgCNi_3$ is electron-type. $R_H$ istemperature independent between $T_c$ and $\sim$ 140 K. Above $\sim$ 140 K, themagnitude of $R_H$ decreases as temperature rises. At T = 100 K, the carrierdensity is $1.0 \times 10^{22}/cm^3$, which is comparable with that inperovskite $(Ba,K)BiO_3$, and less than that of the metallic binary $MgB_2$.Comment: sample quality improved, new figures, submitted to Phys. Rev.

physical review. b, condensed matter

Normal state resistivity, upper critical field, and Hall effect in superconducting perovskite<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">MgCNi</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Normal state resistivity, upper critical field, and Hall effect in superconducting perovskiteMgCNi3