Magnetism in the 2D Limit and Interface Superconductivity in Metal-Insulator La(2-x)Sr(x)CuO(4) Superlattices

Abstract

We show, by means of low-energy muon spin rotation measurements, that few-unit-cells thick La(2)CuO(4) layers synthesized digitally by molecular beam epitaxy synthesis are antiferromagnetically ordered. Below a thickness of about 5 CuO(2) layers the long-range ordered state breaks down, and a magnetic state appears with enhanced quantum fluctuations and a reduced spin stiffness. This magnetic state can exist in close proximity (few Angstrom) to high-temperature superconducting layers, without transmitting supercurrents.

4 pages, 3 figures

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• High-temperature interface superconductivity between metallic and insulating cuprates
• Quantum magnetism and criticality
• Properties of the Ideal Ginzburg-Landau Vortex Lattice
• Superconducting transition at 38 K in insulating-overdoped La2CuO4-La1.64Sr0.36CuO4 superlattices: Evidence for interface electronic redistribution from resonant soft x-ray scattering
• Direct observation of non-local effects in a superconductor
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• Depth dependent spin dynamics of canonical spin glass films: A low-energy muon spin rotation study
• Modulated electronic configurations in selectively doped multilayered nanostructures
• Neel order in the two-dimensional S=1/2 Heisenberg Model

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• Magnetic phase diagram of low-doped La{2-x}SrxCuO4 thin films studied by low-energy muon-spin rotation
• Fabrication of high-temperature quasi-two-dimensional superconductors at the interface of a ferroelectric Ba${}_{0.8}$Sr${}_{0.2}$TiO${}_3$ film and an insulating parent compound of La${}_2$CuO${}_4$
• Evolution of superconducting correlations within magnetic-field-decoupled CuO(2) layers of La(1.905)Ba(0.095)CuO(4)
• A segmented conical electric lens for optimization of the beam spot of the low-energy muon facility at PSI: a Geant4 simulation analysis
• 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
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