Observation of Berezinski-Kosterlitz-Thouless transition in PrYBaCuO/YBaCuO/PrYBaCuO trilayers

Vitali A. Gasparov; I. E. Batov; Qi Li; Chuhe Kwon

doi:10.1117/12.250434

5 July 1996 Observation of Berezinski-Kosterlitz-Thouless transition in PrYBaCuO/YBaCuO/PrYBaCuO trilayers

Vitali A. Gasparov, I. E. Batov, Qi Li, Chuhe Kwon

Proceedings Volume 2697, Oxide Superconductor Physics and Nano-Engineering II; (1996) https://doi.org/10.1117/12.250434
Event: Photonics West '96, 1996, San Jose, CA, United States

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.

Citation Download Citation

Vitali A. Gasparov, I. E. Batov, Qi Li, and Chuhe Kwon "Observation of Berezinski-Kosterlitz-Thouless transition in PrYBaCuO/YBaCuO/PrYBaCuO trilayers", Proc. SPIE 2697, Oxide Superconductor Physics and Nano-Engineering II, (5 July 1996); https://doi.org/10.1117/12.250434

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