腔级Nb的隧道效应研究：可能的表面磁散射
Tunneling study of cavity grade Nb: possible magnetic scattering at the surface
摘要：
对通过用于蚀刻和清洁超导射频（SRF）腔的相同工艺制备的Nb片进行了Tunneling光谱。暴露于空气中，电解抛光的Nb表现出表面超导能隙δ =1.55 meV，清洁，散装Nb的特性。然而，隧穿态密度（DOS）显着加宽。用相同的温和烘烤处理的Nb片用于改善SRF腔中的Q斜率，显示出更尖锐的DOS。使用Shiba理论得到了与DOS的良好拟合，表明准粒子的磁散射是无带隙表面超导性的起源，也是迄今为止未被认识到的Nb SRF腔的Q斜率问题的贡献者。
英文摘要：
Tunneling spectroscopy was performed on Nb pieces prepared by the same processes used to etch and clean superconducting radio frequency (SRF) cavities. Air exposed, electropolished Nb exhibited a surface superconducting gap delta=1.55 meV, characteristic of clean, bulk Nb. However the tunneling density of states (DOS) was broadened significantly. The Nb pieces treated with the same mild baking used to improve the Q-slope in SRF cavities, reveal a sharper DOS. Good fits to the DOS were obtained using Shiba theory, suggesting that magnetic scattering of quasiparticles is the origin of the gapless surface superconductivity and a heretofore unrecognized contributor to the Q-slope problem of Nb SRF cavities.
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