Intralayer carbon substitution in the MgB2 superconductor -: art. no. 134513

被引:176
作者
Takenobu, T [1 ]
Ito, T
Chi, DH
Prassides, K
Iwasa, Y
机构
[1] Japan Adv Inst Sci & Technol, Tatsunokuchi, Ishikawa 9231292, Japan
[2] Univ Sussex, Sch Chem Phys & Environm Sci, Brighton BN1 9QJ, E Sussex, England
[3] NCSR Demokritos, Inst Mat Sci, Athens 15310, Greece
关键词
D O I
10.1103/PhysRevB.64.134513
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We report that the ternary MgB2-xCx compounds adopt an isostructural AlB2-type hexagonal structure in a relatively small range of nominal carbon concentration, x<0.1. The lattice parameter a decreases almost linearly with increasing carbon content x, while the c parameter remains unchanged, indicating that carbon is exclusively substituted in the boron honeycomb layer without affecting the interlayer interactions. The superconducting transition temperature T-c decreases quasilinearly as a function of the carbon concentration. with a slope steeper than that for the isoelectronic Mg1-xAlxB2.
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页数:3
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