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Effect of Mg and C contents in MgCNi3, and structure and superconductivity of MgCNi3-xCox

The effect of Mg and C contents on TC in MgCNi3, and structure and superconductivity of MgCNi3-xCox were studied. It is found that the excess of Mg and C in initial material mixture is favorable to improve TC and obtain single-phase samples. For preparing MgCNi3 superconductor, the optimum composition of starting materials is MgC1.45Ni3 with 20wt.% excess of Mg of the stoichiometric composition. In MgCNi3-xCox system, a continuous solid solution is formed, lattice parameter decreases slightly and TC decreases obviously with increasing x. A suppression of superconductivity is observed due to the substitution of Co (Mn) for Ni. The suppression effect is smaller for the substitution of Co than that of Mn.

preprint2001arXivOpen access
Z. A. RenG. C. CheS. L. JiaH. ChenY. M. NiZ. X. Zhao
cond-mat.supr-con
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Z. A. RenG. C. CheS. L. JiaH. ChenY. M. NiZ. X. Zhao

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