Structural, magnetic, and superconducting properties of pulsed-laser-deposition-grown ${\text{La}}_{1.85}$${\text{Sr}}_{0.15}$${\text{CuO}}_{4}$/${\text{La}}_{2/3}$${\text{Ca}}_{1/3}$${\text{MnO}}_{3}$ superlattices on (001)-oriented ${\text{LaSrAlO}}_{4}$ substrates

Das, Saikat; Sen, Kaushik; Marozau, Ivan; Uribe-Laverde, Miguel Angel; Biskup, N.; Varela, M.; Khaydukov, Y.; Soltwedel, O.; Keller, T.; Döbeli, M.; Schneider, C. W.; Bernhard, Christian

doi:10.1103/PhysRevB.89.094511

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Structural, magnetic, and superconducting properties of pulsed-laser-deposition-grown ${\text{La}}_{1.85}$${\text{Sr}}_{0.15}$${\text{CuO}}_{4}$/${\text{La}}_{2/3}$${\text{Ca}}_{1/3}$${\text{MnO}}_{3}$ superlattices on (001)-oriented ${\text{LaSrAlO}}_{4}$ substrates

Das, Saikat University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Switzerland
Sen, Kaushik University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Switzerland
Marozau, Ivan University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Switzerland
Uribe-Laverde, Miguel Angel University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Switzerland
Biskup, N. Departamento de Física Aplicada III and Instituto Pluridisciplinar, Universidad Complutense de Madrid, Spain
Varela, M. Departamento de Física Aplicada III and Instituto Pluridisciplinar, Universidad Complutense de Madrid, Spain - Materials Science and Technology Division, Oak Ridge National Laboratory, USA
Khaydukov, Y. Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany - Max Planck Society Outstation at the Forschungsneutronenquelle Heinz Maier-Leibnitz (FRM-II), Garching, Germany
Soltwedel, O. Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany - Max Planck Society Outstation at the Forschungsneutronenquelle Heinz Maier-Leibnitz (FRM-II), Garching, Germany
Keller, T. Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany - Max Planck Society Outstation at the Forschungsneutronenquelle Heinz Maier-Leibnitz (FRM-II), Garching, Germany
Döbeli, M. Laboratory of Ion Beam Physics, ETH Zurich, Switzerland
Schneider, C. W. Paul Scherrer Institut, Villigen, Switzerland
Bernhard, Christian University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Switzerland

12.03.2014

Published in:

Physical Review B. - 2014, vol. 89, no. 9, p. 094511

English German Epitaxial La1.85Sr0.15CuO4/La2/3Ca1/3MnO3 (LSCO/LCMO) superlattices on (001)-oriented LaSrAlO4 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 diffraction, 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 high crystalline 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 Tonsetc≈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 TCurie≈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 superconducting orders and, in combination with previous studies on YBa2Cu3O7−x/La2/3Ca1/3MnO3 superlattices, may allow one to identify the relevant mechanisms.

Faculty

Faculté des sciences et de médecine

Department

Département de Physique

Language