Presentation Information
[23a-A307-2]A van der Waals Oxide 2H-NbO2: A Half-filled Mott Insulator
〇Takuto Soma1, Aya Sato1, Akira Ohtomo1 (1.Tokyo Tech., Dept. Chem. Sci. Eng.)
Keywords:
two-dimensional materials,metal-insulator transition,superconductivity
Two-dimensional materials such as graphene and transition metal dichalcogenides are van der Waals (vdW) crystals, in which two-dimensional sheets are aggregated by vdW forces. On the other hand, most layered oxides are ion-bonded compounds in which the layers are aggregated by electrostatic attraction, and vdW crystals are limited to a very small number of materials such as MoO3. However, the structure of LiNbO2, an ion-bonded layered material, can be regarded as a structure in which Li ions are inserted between the layers of 2H-NbO2 as a virtual vdW crystal. In expanding the study of two-dimensional materials to oxides, the vdW oxide 2H-NbO2 was studied both experimentally and computationally using LiNbO2 as a starting compound.