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oai:docta.ucm.es:20.500.14352/913232025-07-16T13:58:23Zcom_20.500.14352_14col_20.500.14352_15

Structural, magnetic, and superconducting properties of pulsed-laser-deposition-grown La_1.85Sr_0.15CuO_4/La_2/3Ca_1/3MnO_3 superlattices on (001)-oriented LaSrAlO_4 substrates Das, Saikat Biskup Zaja, Nevenko Varela Del Arco, María Bernhard, Christian 538.9 Thin-Films Thickness Dependence La_2-Xsrxcuo4 Films Perovskites Temperature Interface Transport Oxides Buffer Layers Física de materiales Física del estado sólido 2211 Física del Estado Sólido Epitaxial La_1.85Sr_0.15CuO4/La_2/3Ca_1/3MnO_3 (LSCO/LCMO) superlattices on (001)-oriented LaSrAlO_4 substrates have been grown with pulsed laser deposition technique. Their structural, magnetic, and superconducting properties have been determined with in situ reflection high-energy electron ffraction, x-ray diffraction, specular neutron reflectometry, scanning transmission electron microscopy, electric transport, and magnetization measurements. We find that despite the large mismatch between the in-plane lattice parameters of LSCO (a = 0.3779 nm) and LCMO (a = 0.387 nm) these superlattices can be grown epitaxially and with a highcrystalline quality. While the first LSCO layer remains clamped to the LaSrAlO4 substrate, a sizable strain relaxation occurs already in the first LCMO layer. The following LSCO and LCMO layers adopt a nearly balanced state in which the tensile and compressive strain effects yield alternating in-plane lattice parameters with an almost constant average value. No major defects are observed in the LSCO layers, while a significant number of vertical antiphase boundaries are found in the LCMO layers. The LSCO layers remain superconducting with a relatively high superconducting onset temperature of T onset c ≈ 36 K. The macroscopic superconducting response is also evident in the magnetization data due to a weak diamagnetic signal below 10 K for H ab and a sizable paramagnetic shift for H c that can be explained in terms of a vortex-pinning-induced flux compression. The LCMO layers maintain a strongly ferromagnetic state with a Curie temperature of T Curie ≈ 190 K and a large low-temperature saturation moment of about 3.5(1) μB per Mn ion. These results suggest that the LSCO/LCMO superlattices can be used to study the interaction between the antagonistic ferromagnetic and uperconducting orders and, in combination with previous studies on YBa_2Cu_3O_7−x /La_2/3Ca_1/3MnO_3 superlattices, may allow one to identify the relevant mechanisms. Swiss National Science Foundation Department of Energy (Estados Unidos) European Commission Gobierno de España Depto. de Estructura de la Materia, Física Térmica y Electrónica Fac. de Ciencias Físicas TRUE pub 2023-12-15T11:12:25Z 2023-12-15T11:12:25Z 2014 journal article VoR https://hdl.handle.net/20.500.14352/91323 1098-0121 10.1103/physrevb.89.094511 1550-235X eng 200020-140225 206021-139102 info:eu-repo/grantAgreement/EC/FP7/239739/EU info:eu-repo/grantAgreement/EC/FP7/283883/EU 16894633 206021_139102 17038190 200020_140225 17027183 S. Das, K. Sen, I. Marozau, M. A. Uribe-Laverde, N. Biskup, M. Varela, Y. Khaydukov, O. Soltwedel, T. Keller, M. Döbeli, C. W. Schneider, and C. Bernhard, Phys. Rev. B 89, 094511 (2014). restricted access application/pdf American Physical Society