Superconductivity depression in ultrathin YBa[sub 2]Cu[sub 3]O[sub 7-δ] layers in La[sub 0.7]Ca[sub 0.3]MnO[sub 3]/YBa[sub 2]Cu[sub 3]O[sub 7-δ] superlattices

Sefrioui, Z.; Varela, M.; Peña, V.; Arias, D.; León, C.; Santamarıa, J.; Villegas, J. E.; Martınez, J. L.; Saldarriaga, W.; Prieto, P.
December 2002
Applied Physics Letters;12/9/2002, Vol. 81 Issue 24, p4568
Academic Journal
We report on the depression of the superconducting critical temperature of ultrathin YBa[sub 2]Cu[sub 3]O[sub 7] (YBCO) layers, when their thickness is reduced in the presence of La[sub 0.7]Ca[sub 0.3]MnO[sub 3] (LCMO) magnetic layers in [LCMO (15 unit cells)/YBCO (N unit cells)] superlattices. The thickness of the manganite layer is kept at 15 unit cells and the YBCO thickness is varied between N = 12 and N = 1 unit cells. The structural analysis, using x-ray diffraction and electron microscopy, shows sharp interfaces with little structural disorder. While a critical temperature, T[sub C] = 85 K, is found for 12 YBCO unit cells, superconductivity is completely suppressed for YBCO layer thickness below 3 unit cells. The possible interaction between superconductivity and magnetism is investigated.


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