About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
|
Symposium
|
Grain Boundaries, Interfaces, and Surfaces: Fundamental Structure-Property-Performance Relationships
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Presentation Title |
Electronic Structure Engineering through Atomic-scale Strain Control In Complex Oxide Heterostructures |
Author(s) |
Peter A. van Aken |
On-Site Speaker (Planned) |
Peter A. van Aken |
Abstract Scope |
In complex oxide systems, the coupling of atomic configurations and electronic degrees of freedom plays a fundamental role in understanding exotic phenomena. Modifying strain by depositing epitaxial thin films on substrates with different lattice spacing results in precise control of the local physical behavior enabling disentangling competing interactions and tuning novel ground states. Here, I demonstrate how strain locally alters physical properties in two different complex oxide systems using analytical HR-STEM. I first describe the electron redistribution and confinement or delocalization depending on the epitaxial strain in LiV2O4 films grown on SrTiO3 and MgO substrates, revealing two competing behaviors, a metallic charge-disordered phase on SrTiO3 and an insulating charge-ordered phase on MgO. The second part focuses on La0.5Sr0.5MnO3-La2CuO4 heterostructures grown on three different substrates, where epitaxial-strain-induced charge rearrangement gives rise to different magnetic phases, an interfacial antiferromagnetic layer and a ferromagnetic metallic region away from the interfaces. |