  The understanding of the interplay between different orders in a solid is a
key challenge in highly correlated electronic systems. In real systems this is
even more difficult since disorder can have a strong influence on the subtle
balance between these orders and thus can obscure the interpretation of the
observed physical properties. Here we present a study on delta-doped La2CuO4
superlattices. By means of molecular beam epitaxy whole LaO-layers were
periodically replaced through SrO-layers providing a charge reservoir, yet
reducing the level of disorder typically present in doped cuprates to an
absolute minimum. The induced superconductivity and its interplay with the
antiferromagnetic order is studied by means of low-energy muSR. We find a
quasi-2D superconducting state which couples to the antiferromagnetic order in
a non-trivial way. Below the superconducting transition temperature, the
magnetic volume fraction increases strongly. The reason could be a charge
redistribution of the free carriers due to the opening of the superconducting
gap which is possible due to the close proximity and low disorder between the
different ordered regions.
