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Crystal growth and characterization of RhPb2 and its related compounds

The physical properties of the intermetallic compound RhPb2 have been unexplored in detail and are controversial so far. Two values of superconducting transition temperatures have been reported experimentally in poly-crystal samples with the I4/mcm structure. Moreover, the recent report of band calculation results showed that RhPb2 with the I4/mmm structure (β-RhPb2) may be a topological superconductor candidate, having a higher Tc ≈ 9.7 K than that of the I4/mcm structure. Therefore, we grew single crystals of RhPb2 and performed X-ray diffraction study and the phase stability by EPMA, and resistivity measurements to clarify this intriguing compound. Surprisingly, the resistivity measurements showed three different values of Tc (1.24 K, 2.32 K, and 6.7 K) despite the same crystal structure (I4/mcm) but different levels of Rh vacancies up to 18%, inspiring that some sort of Rh vacancy ordering may occur.