Superconductivity in the Nb2SnC compound

Details Superconductivity in the Nb2SnC compound Superconductivity in the Nb2SnC compound

2006-04-26

arxiv.org/abs/cond-mat/0604605v1

Physics

Condensed Matter

Superconductivity

paper with 12 pages and 4 figures

Scientific paper

10.1016/j.ssc.2006.05.006

Nb2SnC is a member of the large family of lamellar materials that crystallize in the hexagonal structure with space group P63/mmc which are isomorphs with Cr2AlC, also named H-phase. In spite of the great number of compounds which belong to this family, the superconductivity has been reported only for two cases: Mo2GaC and Nb2SC. In this work we show that superconductivity can be observed in Nb2SnC depending on the synthesis method used. The quality of the superconductor is strongly dependent of the synthesis method and the optimal results were reached for samples synthesized at 2.5 GPa and 523 +/- 50oC. This sample showed a critical temperature close to 7.8K, revealed from magnetization and transport measurement, the highest critical temperature reported up to now for an H-phase.

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