In-depth S/TEM observation of Ti–Hf and Ta–Hf-doped Nb3Sn layers
Nobuya Banno,
Taku Moronaga,
Toru Hara
et al.
Abstract:In superconducting Nb3Sn layers with coherence lengths of approximately 3 nm, grain boundaries act as effective pinning sites. Thus, grain refinement is an essential issue that directly affects the superconducting critical characteristics of the Nb3Sn layer. In recent years, Hf addition to Nb3Sn wires co-doped with Ta has attracted notable interest as a method that enables grain refinement down to several tens of nm. In-depth characterization of the Nb3Sn grain morphology in Hf-doping is crucially important to… Show more
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