HgBa2CuO4+δ (Hg1201) samples with 0.03 ≤ δ ≤ 0.4 have been obtained. The oxygen surplus δ was calculated from thermogravimetric analysis and compared with neutron powder diffraction data. The hole concentration ps has been estimated based on thermoelectric power and verified by bond-valence summation. While Tc changes with both ps and δ parabolically over most of the doping range, ps ≪ 2 δ, suggesting a complicated electric band structure of Hg1201. It was also observed that the magnetization χ of powdered samples decreases with δ in the overdoped region, suggesting a decrease of ns/m* with oxidation, as that reported in overdoped Tl2201 and Tl1201.
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