The flux crystal-growth method is used to grow reasonably sized, single crystals of the cuprate superconductor HgBa2CuO4+δ (Hg1201). One as-grown sample measured had a Tc of about 80 K with a sharp transition (~ 2 K), although signatures of non-uniform doping were observed. Another sample, which was annealed at 300°C at 8 bar of O2 pressure, was successfully overdoped and had a Tc of about 84.5 K, with a transition width of about 2.5 K. This sample also proved to homogenous, with oxygen dopant being evenly distributed. Samples were therefore successfully grown and prepared for future measurements.
This research was supported by the Undergraduate Research Opportunities Program (UROP).
Crystal growth and annealing study of the high-temperature superconductor HgBa2CuO4+δ.
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