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We report on the depression of the superconducting critical temperature ofultra thin YBa2Cu3O7 (YBCO) layers, when their thickness is reduced in presenceof La0.7Ca0.3MnO3 (LCMO) magnetic layers in [LCMO (15 u.c.)/ YBCO(N u.c.)]superlattices. The thickness of the manganite layer is kept at 15 unit cellsand the YBCO thickness is varied between N=12 and N=1 unit cells. Thestructural analysis using x-ray diffraction and electron microscopy shows sharpinterfaces with little structural disorder. While a critical temperature, Tc=85K is found for 12 YBCO unit cells, superconductivity is completely suppressedfor YBCO layer thickness below 3 unit cells. The possible interaction betweensuperconductivity and magnetism is investigated.Comment: 7 pages + 5 figure

Superconductivity depression in ultrathin YBa2Cu3O7−δ layers in La0.7Ca0.3MnO3/YBa2Cu3O7−δ superlattices