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perovskite MgCNi3

By H. T. Zhang, L. Li, Z. Sun and L. Z. Cao

Abstract

Upper critical field Hc2 and Hall coefficient RH in superconducting perovskite MgCNi3 have been studied. The normal state ρ(T) behavior is similar to that observed in oxide perovskite (Ba,K)BiO3 (BKBO), in which ρ(T) fits well curve predicted by Bloch-Grüneisen theory consistently with electron-phonon scattering. Hc2(T), determined from the onset of the resistive superconducting transition under magnetic fields, can be described by an expression Hc2(T) = Hc2(0)[1 − (T/Tc) 2] with the zero-temperature critical field Hc2(0) = 8.1 T followed by conventional type-II superconductors. It is found that RH of MgCNi3 is negative and its magnitude increases as temperature decreases. At T = 100 K, RH = −4.3 ×10−10m3/C, and the calculated carrier density is 1.4 ×1022/cm3, which is comparable with that in perovskite (Ba,K)BiO3, and less than that of the metallic binary MgB2. PACS numbers: 74.70.Ad, 74.60.Ec, 74.25.Fy The recent discovery of superconductivity in the simple intermetallic compound MgB

Year: 2001
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