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In this paper we review some of the recent developments in the studies of thin films of high temperature superconductors. In particular we concentrate on the properties of YBa2Cu3O7. The normal state as well as the superconducting properties of the films are discussed. Evidence is shown for the observation of critical fluctuations near the transition temperature. The coherence length in the CuO plane was found to be ξab(0) = 16 ±2Å and perpendicular to the plane ξc(o) = 2±1Å. We further present results of a new phase Y2Ba4Cu8 O20−x synthesized in thin films and compare its properties to those of YBa2Cu3O7.
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A. Kapitulnik (1988) studied this question.
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