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Abstract

Magnetic Properties of HgBa₂CuO_4+d with varying oxygen content

The influence of oxygen doping on the superconducting properties of HgBa₂CuO_4+d is studied. Ac and dc magnetization measurements on well defined samples (0.01 < d < 0.09) are performed. These measurements as a function of temperature show a parabolic-like behaviour of T_c(d). Analyzing the magnetization curves at T = 5 K yields an estimation of H_c1. The results show a reduction of H_c1 with decreasing oxygen content.