$\text{Ab Initio}$ Theory of the Impact from Grain Boundaries and Substitutional Defects on Superconducting Nb${}_3$Sn

Michelle M. Kelley, Nathan S. Sitaraman, Tomás A. Arias

Grain boundaries play a critical role in applications of superconducting Nb${}_3$Sn: in dc applications, grain boundaries preserve the material's inherently high critical current den…