Dear Colleagues,

The fast increase of data/processing requirements is forcing the use of novel materials and/or computation architectures. One of the most attractive possibilities is the implementation of Complex Correlated Oxides (CCOs) into different technological devices because of their unique capabilities and exciting fundamental impact.

CCOs are materials that show macroscopic quantum phenomena because of the unscreened Coulomb repulsion of d electrons, which gives rise to a delicate entanglement between different degrees of freedom: strain, orbital, charge, and spin. These complex correlated interactions result in a plethora of ground states with ferroic orders and superconductivity as well as showing metal–insulator transitions in some cases. Furthermore, the possibility of bringing different CCOs into direct contact may induce emergent phenomena at the interfaces, where functional properties can be tuned through external stimuli (electric fields, light, etc.). These in operando capabilities, which in some cases also occur in bulk, are the responsibility of memristive states, among others, that are crucial for the development of neuromorphic/bioinspired architectures.

However, one of the most common crystallographic families of CCOs is the perovskite, which requires the use of proper substrates and/or buffer layers for its optimum structural and functional fabrication. This hinders the implantation of CCOs into governed silicon-based technology or flexible devices. In recent years, huge efforts have been employed to release these materials from their on-grown substrate and deterministically transfer them to different substrates with the possibility of forming oxide heterostructures with van der Waals assembly, and efforts have been employed toward their characterization as a function of uniaxial/biaxial strains and bending radius.

This Special Issue aims to present the most recent achievements in oxide tunnel junctions, including advances in oxide interfaces, with neuromorphic perspectives, as well as the advances of freestanding oxides. It will highlight the current and future potential of these materials and boost some of our fundamental interests and societal requirements.

Dr. Victor Rouco
Guest Editor

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• complex oxides
• oxide interfaces
• memristors
• oxide tunnel junctions
• freestanding oxides