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.
Highlights
The copper oxide–based high-temperature superconductors exhibit rich and complex physics [1]
The distance between SrO dopant layers is labeled by N, which is the number of half unit cells separating them, and we will abbreviate this family as δ-LCON
Utilizing low-energy muon spin rotation techniques (LEμSR), we find a nontrivial enhancement of the magnetic volume fraction below the superconducting transition of the Published by the American Physical Society doped region
Summary
The copper oxide–based high-temperature superconductors (cuprates) exhibit rich and complex physics [1]. Even for doping levels where the highest superconducting transition temperature Tc is reached, short-range antiferromagnetic correlations persist. The competition between superconducting and magnetic orders causes a tendency towards electronic phase separation, especially on the underdoped side of the phase diagram. The phase coexistence of superconductivity and antiferromagnetic stripe order in the La2−x−yMySrxCuO4 family was observed at finite temperatures by neutron scattering for M = Nd [2] and muon spin rotation (μSR)/NMR for M = Eu [3]. One source of disorder in the cuprates is the dopant atoms, which adds another level of complexity [5]. In this respect, superoxygenated La2CuO4+δ [6,7] is an interesting. The concomitant magnetic propagation vector remains consistent with that of the stripe-ordered cuprates
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