Generalize the interfacial resistive-switching framework to M/oxide/Nb:STO heterostructures

Determine whether the interfacial switching framework established for metal/Nb-doped SrTiO3 junctions generalizes to metal/oxide/Nb-doped SrTiO3 heterostructures, including which interface dominates switching and whether oxygen-vacancy migration or defect-mediated charge trapping and detrapping controls the observed behavior.

Background

The paper presents metal/Nb:SrTiO3 as a relatively simple platform in which resistive switching is associated primarily with an extrinsic, chemically sensitive interfacial layer. Metal/oxide/Nb:SrTiO3 structures exhibit similar current-voltage characteristics and hysteresis rotation sequences, suggesting that related interfacial physics may apply to them.

The additional oxide layer creates competing possibilities: switching may occur at either the metal/oxide interface or the oxide/Nb:SrTiO3 interface, and both oxygen-vacancy migration and defect-mediated charge trapping/detrapping have been proposed. The paper therefore identifies the transferability and universality of the metal/Nb:SrTiO3 framework as an unresolved issue requiring systematic comparison of switching, retention, endurance, measurement-protocol dependence, and interface chemistry.