Extended phase diagram of La1-xCaxMnO3 by interfacial engineering

The interfacial enhanced ferromagnetism in Maganite/Ruthenate system is regarded as a promising path to broaden the potential of oxide-based electronic device applications. Here, we systematically studied the physical properties of La1-xCaxMnO3/SrRuO3 superlattices and compared them with the La1-xCaxMnO3 thin films and bulk compounds. The La1-xCaxMnO3/SrRuO3 superlattices exhibit significant enhancement of Curie temperature (TC) beyond the corresponding thin films and bulks. Based on these results, we construct an extended phase diagram of La1-xCaxMnO3 under interfacial engineering. We considered the interfacial charge transfer and structural proximity effects as the origin of the interface-induced high-TC. The structural characterizations revealed a pronounced increasement of B-O-B bond angle, which could be the main driving force for the high-TC in the superlattices. Our work inspires a deeper understanding of the collective effects of interfacial charge transfer and structural proximity on the physical properties of oxide heterostructures.