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

Autor(es)

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

• Tipo de documento: Artigo Científico
• Fonte: Materials Chemistry and Physics; v. 302, p. 10-pg., 2023-04-17.

Resumo

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)

• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
• Processo FAPESP: 17/10819-8 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Wagner Benício Bastos
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 18/18236-4 - Desenvolvimento de cerâmicas avançadas à base de CaCu3Ti4O12 na forma de pós, bulks e filmes nanoestruturados: um estudo integrado das propriedades multifuncionais
• Beneficiário: Henrique Piccoli Moreno
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto