Unexplored MBE growth mode reveals new properties of superconducting NbN
Unexplored MBE growth mode reveals new properties of superconducting NbN
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DOI：
10.1103/physrevmaterials.5.024802
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发表时间：
2020-08
影响因子：
3.4
通讯作者：
J. Wright;Celesta S. Chang;D. Waters;Felix Lüpke;R. Feenstra;L. Raymond;R. Koscica;G. Khalsa;D. Muller;H. Xing;D. Jena
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文献类型：
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作者：
J. Wright;Celesta S. Chang;D. Waters;Felix Lüpke;R. Feenstra;L. Raymond;R. Koscica;G. Khalsa;D. Muller;H. Xing;D. Jena
在晶体生长过程中，未经探索的条件常常揭示出惊人的惊喜和新的物理行为机制。在这项工作中，在高于1000摄氏度的温度下进行技术上重要的超导体NbN的分子束外延，发现在整个生长过程中持续的RHEED振荡，原子级光滑的表面，正常的金属磁导率低至37 μ Ω-cm，超导临界温度超过15 K。最值得注意的是，反转的霍尔系数的符号被观察到的NbN膜冷却，和高的材料质量允许在这个超导体中的Abrikosov涡晶格的第一个成像。
Accessing unexplored conditions in crystal growth often reveals remarkable surprises and new regimes of physical behavior. In this work, performing molecular beam epitaxy of the technologically important superconductor NbN at temperatures greater than 1000$^\circ$C, higher than in the past, is found to reveal persistent RHEED oscillations throughout the growth, atomically smooth surfaces, normal metal resistivities as low as 37$\mu\Omega$-cm and superconducting critical temperatures in excess of 15 K. Most remarkably, a reversal of the sign of the Hall coefficient is observed as the NbN films are cooled, and the high material quality allows the first imaging of Abrikosov vortex lattices in this superconductor.