Pulsed laser deposition growth of heteroepitaxial YBa2Cu3O7/La0.67Ca0.33MnO3 superlattices on NdGaO3 and Sr0.7La0.3Al0.65Ta0.35O3 substrates

Abstract

Heteroepitaxial superlattices of [YBa2Cu3O7(n)/ La0.67Ca0.33MnO3(m)]x, where n and m are the number of YBCO and LCMO monolayers and x the number of bilayer repetitions, have been grown with pulsed laser deposition on NdGaO3 (110) and Sr0.7La0.3Al0.65Ta0.35O3 (LSAT) (001). These substrates are well lattice matched with YBCO and LCMO and, unlike the commonly used SrTiO3, they do not give rise to complex and uncontrolled strain effects due to structural transitions at low temperature. The growth dynamics and the structure have been studied in-situ with reflection high energy electron diffraction (RHEED) and ex-situ with scanning transmission electron microscopy (STEM), x-ray diffraction, and neutron reflectometry. The individual layers are found to be flat and continuous over long lateral distances with sharp and coherent interfaces and with a well-defined thickness of the individual layer. The only visible defects are antiphase boundaries in the YBCO layers that originate from perovskite unit cell height steps at the interfaces with the LCMO layers. We also find that the first YBCO monolayer at the interface with LCMO has an unusual growth dynamics and is lacking the CuO chain layer while the subsequent YBCO layers have the regular Y-123 structure. Accordingly, the CuO2 bilayers at both the LCMO/YBCO and the YBCO/LCMO interfaces are lacking one of their neighboring CuO chain layers and thus half of their hole doping reservoir. Nevertheless, from electric transport measurements on asuperlattice with n=2 we obtain evidence that the interfacial CuO2 bilayers remain conducting and even exhibit the onset of a superconducting transition at very low temperature. Finally, we show from dc magnetization and neutron reflectometry measurements that the LCMO layers are strongly ferromagnetic.

References in corpus (16)

• Proximity effects in superconductor-ferromagnet heterostructures
• Complexity in Strongly Correlated Electronic Systems
• Odd Triplet Superconductivity and Related Phenomena in Superconductor-Ferromagnet Structures
• A `checkerboard' electronic crystal state in lightly hole-doped Ca_{2-x}Na_{x}CuO_{2}Cl_{2}
• Critical thickness and orbital ordering in ultrathin La0.7Sr0.3MnO3 films
• Recent advances in pulsed-laser deposition of complex-oxides
• Ferromagnetic/superconducting proximity effect in La0.7Ca0.3MnO3 / YBa2Cu3O7 superlattices
• Magnetic Proximity Effect in Perovskite Superconductor/Ferromagnet Multilayers
• Proximity induced metal/insulator transition in $YB{a}_{2}C{u}_3{O}_7/L{a}_{2/3}C{a}_{1/3}Mn{O}_3$ superlattices
• Suppressed magnetization in La${}_{0.7}$Ca${}_{0.3}$MnO${}_3$/YBa${}_2$Cu${}_3$O${}_{7-\delta }$ superlattices
• Superconductivity depression in ultrathin YBa2Cu3O7-x layers in La0.7Ca0.3MnO3 /YBa2Cu3O7-x superlattices
• Correlation between structure and properties in multiferroic La${}_{0.7}$Ca${}_{0.3}$MnO${}_3$/BaTiO${}_3$ superlattices
• Two-Dimensional Confinement of 3d1 Electrons in LaTiO3/LaAlO3 Multilayers
• Magnetic properties and atomic structure of La(2/3)Ca(1/3)MnO(3)-YBa(2)Cu(3)O(7) heterointerfaces
• X-ray study of structural domains in the near-surface region of SrTiO3-substrates with Y0.6Pr0.4Ba2Cu3O7$ / La2/3Ca1/3MnO3 superlattices grown on top
• Diverging Giant Magnetoresistance in the Limit of Infinitely Conducting Spacer

Cited by in corpus (16)

• Magnetic proximity effect in $\mathbf{YB}{\mathbf{a}}_2\mathbf{C}{\mathbf{u}}_3{\mathbf{O}}_7/L{\mathbf{a}}_{2/3}\mathbf{C}{\mathbf{a}}_{1/3}\mathbf{Mn}{\mathbf{O}}_3$ and $\mathbf{YB}{\mathbf{a}}_2\mathbf{C}{\mathbf{u}}_3{\mathbf{O}}_7/LaMn{\mathbf{O}}_{3+\delta }$ superlattices
• Influence of La and Mn vacancies on the electronic and magnetic properties of LaMnO${}_3$ thin films grown by pulsed laser deposition
• Magnon radiation by moving Abrikosov vortices in ferromagnetic superconductors and superconductor-ferromagnet multilayers
• Depth profile of the ferromagnetic order in a YBa${}_2$Cu${}_3$O${}_7$ / La${}_{2/3}$Ca${}_{1/3}$MnO${}_3$ superlattice on a LSAT substrate: a polarized neutron reflectometry study
• Attenuation of superconductivity in manganite/cuprate heterostructures by epitaxially-induced CuO intergrowths
• High bias anomaly in YBa2Cu3O7/LaMnO_{3+delta}/YBa2Cu3O7 Superconductor/Ferromagnetic Insulator/Superconductor junctions: Evidence for a long-range superconducting proximity effect through the conduction band of a ferromagnetic insulator
• Electronic depth profiles with atomic layer resolution from resonant soft x-ray reflectivity
• X-ray absorption study of the ferromagnetic Cu moment at the $\mathbf{YB}{\mathbf{a}}_2\mathbf{C}{\mathbf{u}}_3{\mathbf{O}}_7/\mathbf{L}{\mathbf{a}}_{2/3}\mathbf{C}{\mathbf{a}}_{1/3}\mathbf{Mn}{\mathbf{O}}_3$ interface and the variation of its exchange interaction with the Mn moment
• Granular superconductivity and magnetic-field-driven recovery of macroscopic coherence in a cuprate/manganite multilayer
• Controlling the strength of ferromagnetic order in YBa${}_2$Cu${}_3$O${}_7$/La${}_{2/3}$Ca${}_{1/3}$MnO${}_3$ multilayers
• X-ray absorption spectroscopy study of the electronic and magnetic proximity effects in YBa${}_2$Cu${}_3$O${}_7$/La${}_{2/3}$Ca${}_{1/3}$MnO${}_3$ and La${}_{2-x}$Sr${}_x$CuO${}_4$/La${}_{2/3}$Ca${}_{1/3}$MnO${}_3$ multilayers
• Structural, magnetic and superconducting properties of pulsed-laser-deposition-grown $\mathrm{L}{\mathrm{a}}_{1.85}\mathrm{S}{\mathrm{r}}_{0.15}\mathrm{Cu}{\mathrm{O}}_4/L{\mathrm{a}}_{2/3}\mathrm{C}{\mathrm{a}}_{1/3}\mathrm{Mn}{\mathrm{O}}_3$ superlattices on $(001)$-oriented $\mathrm{LaSrAl}{\mathrm{O}}_4$ substrates
• YBa2Cu3O7/LaXMnO3 (X: Ca, Sr) based Superconductor/Ferromagnet/Superconductor junctions with memory functionality
• Backfolded acoustic phonons in metal-oxide superlattices
• Superconductivity and charge carrier localization in ultrathin $\mathbf{L}{\mathbf{a}}_{1.85}\mathbf{S}{\mathbf{r}}_{0.15}\mathbf{Cu}{\mathbf{O}}_4/\mathbf{L}{\mathbf{a}}_2\mathbf{Cu}{\mathbf{O}}_4$ bilayers
• Novel Cu-based dz2 order at a YBa2Cu3O7/ manganite interface