Nanoscale Correlations between Metal–Insulator Transition and Resistive Switching Effect in Metallic Perovskite Oxides

Juan Carlos Gonzalez‐Rosillo, Sara Catalano, Ivan Maggio‐Aprile, Marta Gibert, Xavier Obradors, Anna Palau, Teresa Puig.
Small 2020, 2001307.
DOI: 10.1002/smll.202001307

Strongly correlated perovskite oxides are a class of materials with fascinating intrinsic physical functionalities due to the interplay of charge, spin, orbital ordering, and lattice degrees of freedom.

Among the exotic phenomena arising from such an interplay, metal–insulator transitions (MITs) are fundamentally still not fully understood and are of large interest for novel nanoelectronics applications, such as resistive switching‐based memories and neuromorphic computing devices. In particular, rare‐earth nickelates and lanthanum strontium manganites are archetypical examples of bandwidth‐controlled and band‐filling‐controlled MIT, respectively, which are used in this work as a playground to correlate the switching characteristics of the oxides and their MIT properties by means of local probe techniques in a systematic manner. These findings suggest that an electric‐field‐induced MIT can be triggered in these strongly correlated systems upon generation of oxygen vacancies and establish that lower operational voltages and larger resistance ratios are obtained in those films where the MIT lies closer to room temperature. This work demonstrates the potential of using MITs in the next generation of nanoelectronics devices.