R. McFadden

collaborators

5 papers

cond-mat.supr-con2026

Insight into SRF cavity performance from simulations of Nb's surface oxide dissolution and diffusion

Ryan M. L. McFadden, Rowan Becker, Tobias Junginger

We report simulations of the dissolution and diffusion of Nb's surface oxide layer in vacuum. While this chemical doping process is important for the surface preparation of Nb supe…

cond-mat.mtrl-sci2026

Contrasting impurity-induced magnetism and dynamics in 2H-MoTe2

Jonas A. Krieger, Igor P. Rusinov, Sourabh Barua +13

We investigate the behavior of interstitial $^{8}$ Li $^{+}$ implanted near the surface of 2H-MoTe $_{2}$ using $I^^{2}$ -detected NMR. We find that, unlike the muon, $^{8}$ Li $^{+}$ does not show an…

cond-mat.supr-con2026

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 ( $I^»_{L}$ ) and Bardeen-Cooper-Schrieffer (BCS) coherence length ( $I^¾_{0}$ ) in oxygen-doped niobium, with imp…

cond-mat.mtrl-sci2025

Implantation studies of low-energy positive muons in niobium thin films

Ryan M. L. McFadden, Andreas Suter, Leon Ruf +5

Here we study the range of keV positive muons $I^¼^{+}$ implanted in Nb $_{2}$ O $_{5}$ ( $x$ nm)/Nb( $y$ nm)/SiO $_{2}$ (300 nm)/Si [ $x$ = 3.6 nm, 3.3 nm; $y$ = 42.0 nm, 60.1 nm] thin films using…

cond-mat.mtrl-sci2025

Lithium-ion dynamics in synthetic quartz studied via the NMR of implanted $^{8}$ Li $^{+}$

W. Andrew MacFarlane, Ryan M. L. McFadden, Signy Spencer +11

We report $I^^{2}$ -detected nuclear magnetic resonance ( $I^^{2}$ -NMR) measurements of implanted $^{8}$ Li $^{+}$ in a synthetic single crystal of $I^\pm$ -SiO $_{2}$ (quartz). At 6.55 Tesla, the sp…