[1P01-52] Poster Presentation

[1P37] Electrical transport properties of rock-salt structured Nb(O, N) epitaxial thin films

*Yasumichi Cho¹, Kenichi Kaminaga¹, Shingo Maruyama¹, Yuji Matsumoto¹ (1. Tohoku University)

Rock-salt structured niobium nitride (NbN) reportedly demonstrates its superconductivity below T_c = 16 K. In contrast, regarding niobium monoxide (NbO), only its quasi-rock-salt structured bulk with ordered vacancies has been reported, with its superconductivity below 1.5 K. However, recent technical progress has facilitated the epitaxial synthesis of rock-salt NbO through pulsed laser deposition. The electrical transport property of these NbO thin films vary with the film thickness. In the thinner film region, they exhibit insulating behavior, while in the thicker film region, they display metallic behavior with a superconducting transition at maximum T_c = 6.0 K. With the successful realization of rock-salt NbO, an intriguing question arises: What will be the electrical transport property of Nb(O, N), a rock-salt oxynitride? In this study, we prepared epitaxial thin films of rock-salt Nb(O, N) and conducted experimental and theoretical analyses to investigate their electrical transport property.