Microwave measurements of the in-plane and c-axis conductivity in HgBa2CuO4+δ: Discriminating between superconducting fluctuations and pseudogap effects

Grbić, Mihael Srđan and Barišić, N. and Dulčić, Antonije and Kupčić, Ivan and Li, Y. and Zhao, X. and Yu, G. and Dressel, M. and Greven, M. and Požek, Miroslav (2009) Microwave measurements of the in-plane and c-axis conductivity in HgBa2CuO4+δ: Discriminating between superconducting fluctuations and pseudogap effects. Physical Review B, 80 (9). pp. 94511-5. ISSN 1098-0121

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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 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.

Item Type: Article
Keywords: cuprate superconductors, microwaves, pseudogap, fluctuations
Date: September 2009
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2009) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Project code: 119-1191458-1022, 119-1191458-0512
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 30 May 2014 16:22
Last Modified: 12 Feb 2016 15:30
URI: http://digre.pmf.unizg.hr/id/eprint/2027

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