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Superlattices of correlated oxides have been used to explore interfacialeffects and to achieve additional control over the physical properties ofindividual constituents. In this work, we present a first-principlesperspective of the strain and thickness effects inLa$_{2/3}$Sr$_{1/3}$MnO$_3$/YBa$_2$Cu$_3$O$_{7}$ (LSMO/YBCO) superlattices. Ourfindings indicate that the presence of epitaxial strain and LSMO leads to areduction of buckling parameters of the interfacial CuO$_2$ planes, as well asthe transfer of electrons from LSMO to YBCO. In addition, the change in Cu-3$d$valence is slightly dependent on the LSMO layer thickness. More interestingly,the in-plane ferromagnetic ground state within the CuO$_2$ planes near theinterface is induced due to the local moments centered at the copper atoms.These local moments are decoupled from the charge transfer and, according toour calculations, appear mainly due to the Mn $3d$-O $2p$-Cu $3d$ hybridizationbeing restricted to the interfacial region. The induced net magnetic orderingin interfacial copper atoms may have implications in the control of thesuperconducting state in the LSMO/YBCO superlattices.

Interfacial and thickness effects in La$_{2/3}$Sr$_{1/3}$MnO$_3$/YBa$_2$Cu$_3$O$_{7}$ superlattices