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Superconductivity at 9.5 K in the Ti2GeC compound

Bortolozo A. D., Sant'Anna O. H., Dos Santos C. A. M., Machado A. J. S.

Materials Science Poland

2012

Vol. 30, No. 2

92--97

We report on the investigation of the Ti2GeC properties by X-ray diffraction, magnetic and electrical resistivity measurements. Polycrystalline samples of Ti2GeC with nominal compositions were prepared by solid state reaction. X-ray powder patterns suggest that all peaks can be indexed with the hexagonal phase of Cr2AlC prototype. The temperature dependence of both electrical resistivity and magnetization indicate a bulk type-II superconductivity at 9.5 K. Magnetoresistive data suggest an upper critical field of Bc2 -- 8.1 T and coherence length - 61 A° . Furthermore, the results highlight the highest critical temperature reported up to now for an H-phase.