Temperature range of superconducting fluctuations above Tc in YBa2Cu3O7−δ single crystals

Grbić, Mihael Srđan and Požek, Miroslav and Paar, Dalibor and Hinkov, Vladimir and Raichle, Markus and Haug, Daniel and Keimer, Bernd and Barišić, Neven and Dulčić, Antonije (2011) Temperature range of superconducting fluctuations above Tc in YBa2Cu3O7−δ single crystals. Physical Review B, 83 (14). pp. 144508-12. ISSN 1098-0121

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Microwave absorption measurements in magnetic fields from 0 up to 16 T were used to determine the temperature range of superconducting fluctuations above the superconducting critical temperature Tc in YBa2Cu3O7−δ. Measurements were performed on deeply underdoped, slightly underdoped, and overdoped single crystals. The temperature range of the superconducting fluctuations above Tc is determined by an experimental method which is free from arbitrary assumptions about subtracting the nonsuperconducting contributions to the total measured signal and/or theoretical models to extract the unknown parameters. The superconducting fluctuations are detected in the ab plane, and c-axis conductivity, by identifying the onset temperature T′. Within the sensitivity of the method, this fluctuation regime is found only within a fairly narrow region above Tc. Its width increases from 7 K in the overdoped sample (Tc=89 K) to, at most, 23 K in the deeply underdoped sample (Tc=57 K), so that T′ falls well below the pseudogap temperature T∗. Implications of these findings are discussed in the context of other experimental probes of superconducting fluctuations in the cuprates.

Item Type: Article
Keywords: cuprate superconductors, response to electromagnetic fields, fluctuation phenomena, superconductivity phase diagrams
Date: April 2011
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2011) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Project code: 119-1191458-1022
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 01 Jun 2014 19:59
Last Modified: 12 Feb 2016 16:51
URI: http://digre.pmf.unizg.hr/id/eprint/2075

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