Abstract
An approach to microwave measurements is used in order to determine both, the in-plane and out-of-plane conductivity of the high-Tc superconductor HgBa2CuO4+δ near optimal doping. Unlike the ab-plane conductivity, the c-axis conductivity is highly sensitive to superconducting fluctuations. From a single c-axis data set, we can clearly discern the opening of the pseudogap at T∗=185(15) K, the appearance of the superconducting fluctuations at a much lower temperature T′=105(2) K, and the full transition to the superconducting state at the critical temperature Tc=94.3 K. Thus, with the present high sensitivity, we establish that the extent of the superconducting fluctuations is only about 10 K above Tc.
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