Abstract
This work reports a systematic study on the structural and superconducting properties in the Hg–Sm–In–Pb system. It is investigated how In and Sm dopings influence the superconducting properties of the HgPb 2 phase which was recently reported. Results for the HgSm 1 − x Pb 2 system show that Sm atoms substitute Hg vacancies in the tetragonal phase which do not affect the onset critical temperature of the HgPb 2 compound. Simultaneous Sm and In doping effects on the properties of the HgPb 2 phase are also studied. Experimental and simulations of X-ray powder diffractograms suggest that the HgSm 1 − x In x Pb 2 system (0.2 ≤ x ≤ 0.7) has a pseudo-cubic structure with lattice parameters near 4.88 Å. Superconducting properties measurements show that this system has an optimum doping at x ∼ 0.5 with the onset critical temperature close to 6.9 K. This is the highest superconducting critical temperature for the AuCu prototype so far reported.
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