Universal defect behavior in Nb-Xsuperconductors: The lattice-parameter correlation

Abstract
A correlation between the reduction in Tc and the increase in lattice parameter is shown for a wide variety of chemically diverse, stoichiometric and nonstoichiometric, bulk and film, as-grown, and radiation-damaged niobium-based A15 superconductors. The correlation is discussed in terms of generalized defects. The Tc of nearly defect-free Nb3Si is also predicted.

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