Niobium monoxide generally refers to Nb₃O₃ with a pseudorock-salt structure, which is known as thermodynamically the most stable phase, exhibiting superconductivity below 1.38 K; neither bulk nor thin film form of rock-salt NbO thus has been reported so far. In this study, metastable rock-salt NbO has been successfully synthesized through a nonequilibrium process with vapor deposition. The present synthesis of rock-salt NbO marked its enhancement of superconductivity, whose transition temperature could reach up to 7.4 K, more than 5 times as high as that of the pseudorock-salt Nb₃O₃. The structure-sensitive electronic properties of the rock-salt NbO will be further discussed not only experimentally but also theoretically with the aid of DFT + U + V calculations.

中文翻译：

---

提高外延稳定岩盐 NbO 的超导温度


一氧化铌一般指具有假岩盐结构的Nb ₃ O ₃ ，被称为热力学上最稳定的相，在1.38K以下表现出超导性；因此，到目前为止，无论是块状还是薄膜形式的岩盐 NbO 都尚未被报道。在这项研究中，通过气相沉积的非平衡过程成功合成了亚稳态岩盐 NbO。目前合成的岩盐 NbO 标志着其超导性的增强，其转变温度可达 7.4 K，是假岩盐 Nb ₃ O ₃