Abstract
A series of samples of (MgB2−x C x )0.97Cu0.03 (x=0.00, 0.05, 0.10, 0.15, 0.20, 0.25) and MgB2 were synthesized by a solid state reaction method. The structure, superconducting transition temperature and transport properties of the samples were studied by means of X-ray diffraction (XRD) and resistivity measurements. It is found that the c-axis of the lattice remains unchanged with increasing C doping, while the a-axis shows a small decrease. The T c of the samples steadily decreases with increasing C doping. It is suggested that the chemical pressure effect plays a more important role influencing the normal state transport and T c than the change of carrier concentration.
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Wei, G., Sun, A., Ma, J. et al. Structure and Superconductivity of (MgB2−x C x )0.97Cu0.03 . J Supercond Nov Magn 23, 209–212 (2010). https://doi.org/10.1007/s10948-009-0517-2
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DOI: https://doi.org/10.1007/s10948-009-0517-2