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

Scientific paper - Original scientific paper

• Author: Mihael Srđan Grbić
• Author: Miroslav Požek
• Author: Dalibor Paar
• Author: Vladimir Hinkov
• Author: Markus Raichle
• Author: Daniel Haug
• Author: Bernd Keimer
• Author: Neven Barišić
• Author: Antonije Dulčić
• Author's institution: University of Zagreb; Faculty of Science; (Department of Physics)
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract (english)

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.

• Keywords (english): cuprate superconductors; response to electromagnetic fields; fluctuation phenomena; superconductivity phase diagrams
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Physical review B: Condensed matter and materials physics
• Numbering: vol. 83, no. 14, 144508
• p-ISSN: 1098-0121
• e-ISSN: 1550-235X
• DOI: https://doi.org/10.1103/PhysRevB.83.144508
• URN:NBN: urn:nbn:hr:217:371162
• Publication: 2011
• Project: Number: 119-1191458-1022; Title (croatian): Mikrovalna istraživanja novih materijala; Leader: Miroslav Požek; Jurisdiction: Croatia; Funding stream: ZP
• Document URL: http://link.aps.org/doi/10.1103/PhysRevB.83.144508
• Type of resource: Text
• Access conditions: Open access
• Public note: Copyright (2011) by the American Physical Society. Received 27 May 2010; revised manuscript received 15 February 2011; published 13 April 2011.
• Created on: 2019-11-15 14:13:06