Carbon Concentration Dependence of the Superconducting Transition Temperature and Structure of MgCxNi3

Details Carbon Concentration Dependence of the Superconducting Transition Temperature and Structure of MgCxNi3 Carbon Concentration Dependence of the Superconducting Transition Temperature and Structure of MgCxNi3

2001-10-29

arxiv.org/abs/cond-mat/0110604v1

Physics

Condensed Matter

Superconductivity

4 figures

Scientific paper

10.1016/S0038-1098(01)00470-7

The crystal structure of the superconductor MgCxNi3 is reported as a function of carbon concentration determined by powder neutron diffraction. The single-phase perovskite structure was found in only a narrow range of carbon content, 0.88 < x < 1.0. The superconducting transition temperature was found to decrease systematically with decreasing carbon concentration. The introduction of carbon vacancies has a significant effect on the positions of the Ni atoms. No evidence for long range magnetic ordering was seen by neutron diffraction for carbon stoichiometries within the perovskite phase stability range.

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