Normal state resistivity, upper critical field, and Hall effect in superconducting perovskite MgCNi3 - art. no. 132505

The normal state resistivtity, upper critical field H-c2 and Hall coefficie nt R-H in superconducting perovskite MgCNi3 (T-c approximate to 8 K) have b een studied. Above 70 K. rho (T) fits well curve predicted by Bloch-Gruneis en theory consistently with electron-phonon scattering. H-c2(0) was estimat ed to be about 15.0 T within the weak-coupling BCS theory, and the supercon ducting coherence length xi (0) is approximately 47 Angstrom. R-H of MgCNi3 is negative for the whole temperature range which definitely indicates tha t the carrier in MgCNi3 is electron type. R-H is temperature independent be tween T-c and similar to 140 K. Above similar to 140 K, the magnitude of R- H decreases as temperature rises. At T = 100 K. the carrier density is 10x 10(22)/cm(3). which is comparable with that in perovskite (Ba,K)BiO3, and l ess than that of the metallic binary MgB2.