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The shape of 3$d$-orbitals often governs the electronic and magneticproperties of correlated transition metal oxides. In the superconductingcuprates, the planar confinement of the $d_{x^2-y^2}$ orbital dictates thetwo-dimensional nature of the unconventional superconductivity and a competingcharge order. Achieving orbital-specific control of the electronic structure toallow coupling pathways across adjacent planes would enable direct assessmentof the role of dimensionality in the intertwined orders. Using Cu-$L_3$ andPr-$M_5$ resonant x-ray scattering and first-principles calculations, we reporta highly correlated three-dimensional charge order in Pr-substitutedYBa$_2$Cu$_3$O$_{7}$, where the Pr $f$-electrons create a direct orbital bridgebetween CuO$_2$ planes. With this, we demonstrate that interplanar orbitalengineering can be used to surgically control electronic phases in correlatedoxides and other layered materials.

Stabilization of three-dimensional charge order through interplanar orbital hybridization in Pr$_x$Y$_{1-x}$Ba$_2$Cu$_3$O$_{6+\delta}$