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.
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