A Perovskite-Derivative Nickelate Offering More Durable, Sustainable Multi-Level Non-Volatile Phase Change Memory

A technical paper titled “Thermally Reentrant Crystalline Phase Change in Perovskite-Derivative Nickelate Enabling Reversible Switching of Room-Temperature Electrical Resistivity” was published by researchers at Tohoku University and University of Tsukuba.

Abstract:

“Reversible switching of room-temperature electrical resistivity due to crystal-amorphous transition is demonstrated in various chalcogenides for development of non-volatile phase change memory. However, such reversible thermal switching of room-temperature electrical resistivity has not reported in transition metal oxides so far, despite their enormous studies on the electrical conduction like metal-insulator transition and colossal magnetoresistance effect. In this study, a thermally reversible switching of room-temperature electrical resistivity is reported with gigantic variation in a layered nickelate Sr_2.5Bi_0.5NiO₅ (1201-SBNO) composed of (Sr_1.5Bi_0.5)O₂ rock-salt and SrNiO₃ perovskite layers via unique crystalline phase changes between the conducting 1201-SBNO with ordered (O-1201), disordered Sr/Bi arrangements in the (Sr_1.5Bi_0.5)O₂ layer (D-1201), and insulating oxygen-deficient double perovskite Sr₂BiNiO_4.5 (d-perovskite). The O-1201 is reentrant by high-temperature annealing of ≈1000 °C through crystalline phase change into the D-1201 and d-perovskite, resulting in the thermally reversible switching of room-temperature electrical resistivity with 10²– and 10⁹-fold variation, respectively. The 1201-SBNO is the first oxide to show the thermally reversible switching of room-temperature electrical resistivity via the crystalline phase changes, providing a new perspective on the electrical conduction for transition metal oxides.”

Find the technical paper here. Published September 2023.

Matsumoto, K., Kawasoko, H., Nishibori, E., Fukumura, T., Thermally Reentrant Crystalline Phase Change in Perovskite-Derivative Nickelate Enabling Reversible Switching of Room-Temperature Electrical Resistivity. Adv. Sci. 2023, 2304978. https://doi.org/10.1002/advs.202304978

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