Unveiling the metal-insulator transition at YTiO3/LaTiO3 interfaces grown by the soft chemical method

Author(s)

Cabral, Ana Cristina Tolentino ; Tanta, Urbano Miguel Tafur ; Simoes, Alexandre Zirpoli ; Bastos, Wagner ; Moreno, Henrique ; Ramirez, Miguel Angel ; Ponce, Miguel Adolfo ; Moura, Francisco

• Document type: Journal article
• Source: Materials Chemistry and Physics; v. 302, p. 10-pg., 2023-04-17.

Abstract

In the last couple of years, perovskites and transition metal oxides have demonstrated high potential for energy storage/processing applications. Oxide interfaces with piezoelectric, magnetic and metal-insulator transition based on YTiO3/LaTiO3 heterostructured films were investigated in this work. The Mott insulator, YTiO3, was deposited onto a Mott insulator, LaTiO3, via polymeric precursor method. Spin coating was performed to obtain a YTiO3/LaTiO3 heterostructed thin films deposited onto Pt/TiO2/SiO2/Si substrates. Structure, morphology, and electrical properties of the films were assessed. The YTiO3/LaTiO3 heterostructures exhibit ferromagnetic and piezoelectric behavior (d33m ' ax approximate to 8.11 p.m./V), which may be attributed to smaller grain (average grain size approximate to 20.00 nm) and, thus, a higher grain boundary density, and stress in the film plane due to the different properties of the interface. The dielectric permittivity and dielectric loss at 1 KHz were found to be 70 and 0.41, respectively. I-V measurements on different electrode areas confirmed a metal-to-insulator transition, indicating a potential aplication in correlated electron random access memory (CeRAM). (AU)

• FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
• Grantee: Elson Longo da Silva
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC
• FAPESP's process: 17/10819-8 - CDMF - Center for the Development of Functional Materials
• Grantee: Wagner Benício Bastos
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 18/18236-4 - Development of advanced CaCu3Ti4O12 ceramics in the form of powders, bulks, and nanostructured films: an integrated studied of its multifunctional properties
• Grantee: Henrique Piccoli Moreno
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)