发表机构
University of California Santa Barbara; Northwestern University; Oak Ridge National Laboratory（加州大学圣塔芭芭拉分校; 西北大学; 橡树岭国家实验室）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过高压激光浮区法合成岩盐结构LaN$_{0.94}$，证实其为稀土一氮化物中首个体超导体，超导转变温度5.95 K，为系列探索奠定基础。
AI 中文摘要
我们报道了在激光浮区炉中，通过镧金属与高压氮气直接反应合成并表征氮化镧。同步辐射X射线和中子衍射测量证实其具有岩盐结构，化学计量比为LaN$_{0.94}$，这与第一性原理预测的LaN在化学计量极限下动态不稳定的结论一致。电输运、热容和磁化测量表明，LaN$_{0.94}$呈金属性，超导转变温度$T_c=5.95$ K。我们的数据确立了LaN是稀土一氮化物家族中首个体超导成员，并推动了利用高压光学反应器提供的独特加工空间对该系列进行未来探索。
英文摘要
We report the synthesis and characterization of lanthanum nitride by direct reaction of lanthanum metal with high pressure nitrogen gas in a laser floating-zone furnace. Combined synchrotron X-ray and neutron diffraction measurement verifies a rocksalt structure with stoichiometry LaN$_{0.94}$, consistent with first principles prediction that LaN is dynamically unstable in the stoichiometric limit. Electrical transport, heat capacity, and magnetization measurements show that LaN$_{0.94}$ is metallic with a superconducting transition at $T_c=5.95$ K. Our data establish LaN as the first bulk superconducting member of the rare earth mononitride family and motivates future exploration of the series using the unique processing space afforded by high-pressure optical reactors.
Comments8 pages, 5 figures
