Normal state resistivity, upper critical field, and Hall effect in superconducting perovskite MgCNi3
S. Y. Li, R. Fan, X. H. Chen, C. H. Wang, W. Q. Mo, K. Q. Ruan, Y. M. Xiong, X. G. Luo, H. T. Zhang, L. Li, Z. Sun, L. Z. Cao
DOI 10.1103/PhysRevB.64.132505 · Physical Review B
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Abstract
The normal state resistivtity, upper critical field Hc2 and Hall coefficient RH in superconducting perovskite MgCNi3 (Tc≈8 K) have been studied. Above 70 K, ρ(T) fits well curve predicted by Bloch-Grüneisen theory consistently with electron-phonon scattering. Hc2(0) was estimated to be about 15.0 T within the weak-coupling BCS theory, and the superconducting coherence length ξ(0) is approximately 47 Å. RH of MgCNi3 is negative for the whole temperature range which definitely indicates that the carrier in MgCNi3 is electron type. RH is temperature independent between Tc and ∼140 K. Above ∼140 K, the magnitude of RH decreases as temperature rises. At T=100 K, the carrier density is 1.0×1022/cm3, which is comparable with that in perovskite (Ba,K)BiO3, and less than that of the metallic binary MgB2.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| MgCNi3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8 | Pressure not reported | midpoint |
| MgCNi3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.2 | Pressure not reported | onset |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 39 | Pressure not reported | unknown |
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