2026-06-29T08:22:18Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/593332023-08-25T19:29:28Zcom_20.500.14352_14col_20.500.14352_15

Critical temperature depression and persistent photoconductivity in ion irradiated YBa2Cu3O7-x films and YBa2Cu3O7-x/PrBa2Cu3O7 superlattices Lucía Mulas, María Luisa Sánchez Quesada, Francisco Santamaría Sánchez-Barriga, Jacobo Sefrioui, Zouhair Arias Serna, Diego Loos, G. Navacerrada, M.A. 537 Thin-Films Columnar Defects Enhancement Superconductivity Crystals. Electricidad Electrónica (Física) 2202.03 Electricidad © American Institute of Physics. G.L. thanks the SAB1995-0685 to Ministerio de Educación y Cultura. Financial support from CICYT grant MAT970675/96-7054 is also acknowledged. Implantation experiments have been carried out at the CAI of Universidad Complutense. We have studied the effect of He+ irradiation with doses in the range 10(12)-2x10(15) cm(-2) on two high-temperature superconducting structures: YBa2Cu3O7-x (YBCO) films and YBa2Cu3O7-x/PrBa2Cu3O7 (YBCO/PBCO) superlattices. In particular we have focused on superlattices [YBCON/PBCOM](1000 Angstrom) with N=1, 8 unit cells of YBCO, and M=5 unit cells of PBCO, with a total thickness of 1000 Angstrom. The analysis is presented in terms of depression of the critical temperature (T-c) and modification of the crystalline structure using X ray refinement technique. Single films show a systematic increase in the c-lattice parameter upon irradiation, which is not observed in thin one unit cell YBCO layers in superlattice structures. However, T-c depression resulting from irradiation is deeper in superlattices. These results are explained considering the strained nature of the as-grown [YBCON/PBCO5](1000 Angstrom) superlattices with low values of N. Both structures show persistent photoconductivity, indicating that defects are related to oxygen displacements in the Cu-O chains. Ministerio de Educación y Cultura CICYT Depto. de Estructura de la Materia, Física Térmica y Electrónica Fac. de Ciencias Físicas TRUE pub 2023-06-20T19:09:47Z 2023-06-20T19:09:47Z 2000-05-29 journal article https://hdl.handle.net/20.500.14352/59333 0003-6951 10.1063/1.126609 eng SAB1995-0685 MAT970675/96-7054 open access application/pdf Amer Inst Physics