Abstract
Precise measurement of the surface impedance Z S = R S + i X S of Bi 2Sr 2CaCu 2O 8+ x superconducting films as a function of temperature and r.f. magnetic field are reported. The samples are grown by Liquid-Phase-Epitaxy (LPE) on LaAlO 3 and Th:LaAlO 3 (100) substrates. The measurements are performed by a meander-line microstrip resonator operating at 2 GHz. All the samples show high residual losses ( R S = 0.4 mΩ at T = 4.2 K ). The temperature dependence of the ab-plane penetration depth has a quadratic beavior at low temperatures. The microwave power dependence of the surface impedance shows evidence of vortex penetration in weak links inside the films.
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