# Superconductivity drives magnetism in delta-doped La2CuO4

## TL;DR

This study investigates how superconductivity influences magnetism in delta-doped La2CuO4 superlattices, revealing a complex interaction where superconductivity enhances magnetic order, facilitated by minimal disorder and charge redistribution.

## Contribution

It demonstrates the interplay between superconductivity and antiferromagnetism in highly controlled, low-disorder delta-doped La2CuO4 superlattices using molecular beam epitaxy and muSR techniques.

## Key findings

- Superconductivity couples with antiferromagnetic order in a non-trivial way.
- Magnetic volume fraction increases below the superconducting transition.
- Charge redistribution may enhance magnetic order due to superconducting gap opening.

## Abstract

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.