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Proceedings Paper

Observation of Berezinski-Kosterlitz-Thouless transition in PrYBaCuO/YBaCuO/PrYBaCuO trilayers
Author(s): Vitali A. Gasparov; I. E. Batov; Qi Li; Chuhe Kwon
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Paper Abstract

The temperature dependencies of electromagnetic penetration depth )a,b(T) and high-frequency losses ReoT) have been investigated using the radio-frequency (1-20 MHz) and microwave (30 GHz) surface impedance methods on 1 unit cell (UC) and 2UC-thick Y1Ba2Cu3 epitaxial films sandwiched between Pro6Yo.4Ba2Cu3O7_ epitaxial layers. It was observed that the A(T) component exhibits a clear break near the critical temperature T from a linear BCS-like dependence at low temperatures, and a maximum in Rec(T) close to the onset point of L1(T). The break is destroyed in a very small perpendicular magnetic field (' 1 mT). This feature exhibit saturation as a function of the magnetic field in the range 3-5 mT. At the same time, no influence of the same H on the Reo(T) dependence at microwave frequencies was detected. A huge increase in T (70% and 30% for 1UC and 2UC samples, respectively) as a function offrequency within the frequency range 1 MHz —30 GHz was discovered. All these features are explained and discussed in the framework of dynamic theories of BKT transition.

Paper Details

Date Published: 5 July 1996
PDF: 12 pages
Proc. SPIE 2697, Oxide Superconductor Physics and Nano-Engineering II, (5 July 1996); doi: 10.1117/12.250434
Show Author Affiliations
Vitali A. Gasparov, Institute of Solid State Physics (Russia)
I. E. Batov, Institute of Solid State Physics (Russia)
Qi Li, Pennsylvania State Univ. (United States)
Chuhe Kwon, Univ. of Maryland/College Park (United States)

Published in SPIE Proceedings Vol. 2697:
Oxide Superconductor Physics and Nano-Engineering II
Ivan Bozovic; Davor Pavuna, Editor(s)

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