Presentation Information
[20a-P02-19]Emergence of superconductivity via lattice strain control in rock-salt structured thin film NbO
〇(M2)Rintaro Kimura1, Kenichi Kaminaga1, Shingo Maruyama1, Yuji Matsumoto1 (1.Tohoku Grad. Sch.)
Keywords:
Pulsed Laser Deposition,Superconductivity,Niobium Oxide
Niobium monoxide (NbO) thin film have not been prepared, and pseudo-rock-salt type bulk materials in previous report are metallic and show superconductivity of Tc = 1.5 K. In our previous study, we succeeded in fabricating a novel rock-salt NbO thin film by PLD method and reported semiconducting resistivity at 20 nm thickness and metallic superconductivity at 400 nm thickness with Tconset = 6.0 K, and considered that this semiconductor-superconductor transition is due to relaxation of lattice strain from the substrate with increasing film thickness. In this study, we report the results on the correlation between the effect of lattice strain, resistivity and superconducting transition temperature by controlling the film thickness.