Direct observation of the electrically triggered Insulator-Metal transition in V3O5 far below the transition temperature

Abstract

Resistive switching is one of the key phenomena for applications such as nonvolatile memories or neuromorphic computing. V3O5, a compound of the vanadium oxide Magnéli series, is one of the rare materials to exhibit an insulator-metal transition (IMT) above room temperature (Tc ~ 415 K). Here we demonstrate both static dc resistive switching (RS) and fast oscillatory spiking regimes in V3O5 devices at room temperature (120 K below the phase transition temperature) by applying an electric field. We use operando optical imaging to track a reflectivity change during the RS and find that a percolating high temperature metallic phase filament is formed. This demonstrates that the electrically induced RS triggers the phase transition. Furthermore, we optically capture the spiking oscillations that we link to the negative differential resistance regime and find the filament forms and dissolves via a periodic spatio-temporal instability that we describe by numerical simulations.

References in corpus (2)

• First-Order Insulator-to-Metal Mott Transition in the Paramagnetic 3D System GaTa4Se8
• Electrodynamics near the Metal-to-Insulator Transition in V3O5

Cited by in corpus (9)

• Quantum materials for energy-efficient neuromorphic computing
• Resistive switching in reverse: voltage driven formation of a transverse insulating barrier
• Spin and charge modulations of a half-filled extended Hubbard model
• Magnetoresistance anomaly during the electrical triggering of a metal-insulator transition
• Voltage control of spin resonance in phase change materials
• Electrically driven insulator-to-metal transition in a correlated insulator: Electronic mechanism and thermal description
• First-principles Prediction of Potential Candidate Materials MCu${}_3$X${}_4$ (M = V, Nb, Ta; X = S, Se, Te) for Neuromorphic Computing
• Dynamic nanoscale spatial heterogeneity in a perovskite to brownmillerite topotactic phase transformation
• Volatile resistive-switched state in a bulk organic conductor with a sharp metal-insulator transition