[22p-E204-1~13] 6.3 Oxide electronics

△ [22p-E204-1] A possible Mott insulator with high electron mobility: Rock-salt structured NbO epitaxial thin film

〇(B)Rintaro Kimura¹, Kenichi Kaminaga², Shingo Maruyama², Yuji Matsumoto² (1.Tohoku Univ., 2.Tohoku Grad. Sch.)

Keywords:Pulsed Laser Deposition, Mott insulator, Niobium Oxide

Transition metal monoxides generally have a rock-salt structure, which is chemically unstable and insulating. In contrast, NbO is a chemically stable pseudo-rock salt form (Nb₃O₃, a = 4.21 Å) with ordered vacancies, where Nb and O are removed by 25% each from the rock salt form (Nb₄O₄). In contrast, NbO has a chemically stable pseudo-rock salt type (Nb₃O₃, a = 4.21 Å) with ordered vacancies, in which 25% of Nb and O are removed from the rock salt type (Nb₄O₄), and shows metallic superconductivity with Tc = 1.5 K. The previously reported NbO The previously reported NbO is only bulk pseudo-rock salt type Nb₃O₃, and there is no report of synthesis of rock salt type Nb₄O₄. This time In this study, we succeeded in fabricating NbO epitaxial thin films of rock-salt type Nb₄O₄ by pulsed laser deposition.We have successfully fabricated NbO 62 cm²/V.s at room temperature.