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Artificial crystals synthesized by atomic-scale epitaxy provides the abilityto control the dimensions of the quantum phases and associated phasetransitions via precise thickness modulation. In particular, reduction indimensionality via quantized control of atomic layers is a powerful approach torevealing hidden electronic and magnetic phases. Here, we demonstrate adimensionality-controlled and induced metal-insulator transition (MIT) inatomically designed superlattices by synthesizing a genuine two dimensional(2D) SrRuO3 crystal with highly suppressed charge transfer. The tendency toferromagnetically align the spins in SrRuO3 layer diminishes in 2D as theinterlayer exchange interaction vanishes, accompanying the 2D localization ofelectrons. Furthermore, electronic and magnetic instabilities in the two SrRuO3unit cell layers induce a thermally-driven MIT along with a metamagnetictransition.

Phase Instability amid Dimensional Crossover in Artificial Oxide Crystal