Niobium's intrinsic coherence length and penetration depth revisited using low-energy muon spin spectroscopy and secondary-ion mass spectrometry

Ryan M. L. McFadden, Jonathan W. Angle, Eric M. Lechner +7

We report direct, simultaneous measurements of the London penetration depth (${\lambda }_L$) and Bardeen-Cooper-Schrieffer (BCS) coherence length (${\xi }_0$) in oxygen-doped niobium, with impur…