Microwave measurements of the in-plane and c -axis conductivity in HgBa2 CuO4+δ: Discriminating between superconducting fluctuations and pseudogap effects

M. S. Grbić, N. Baričić, A. Dulčić, I. Kupčić, Y. Li, X. Zhao, G. Yu, M. Dressel, M. Greven, M. Požek

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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 HgBa2 CuO4+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.

Original languageEnglish (US)
Article number094511
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume80
Issue number9
DOIs
StatePublished - Sep 16 2009

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