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Accessing unexplored conditions in crystal growth often reveals remarkablesurprises and new regimes of physical behavior. In this work, performingmolecular beam epitaxy of the technologically important superconductor NbN attemperatures greater than 1000$^\circ$C, higher than in the past, is found toreveal persistent RHEED oscillations throughout the growth, atomically smoothsurfaces, normal metal resistivities as low as 37$\mu\Omega$-cm andsuperconducting critical temperatures in excess of 15 K. Most remarkably, areversal of the sign of the Hall coefficient is observed as the NbN films arecooled, and the high material quality allows the first imaging of Abrikosovvortex lattices in this superconductor.

An unexplored MBE growth mode reveals new properties of superconducting NbN