中尺度NbN-Fe-NbN外延结构中超导序参量的鲁棒耦合
Robust coupling of superconducting order parameter in a mesoscale NbN-Fe-NbN epitaxial structure
摘要：
我们报道了一种非传统的和有前途的方法，自组装分布式超导体-铁磁-超导体（S-F-S）约瑟夫森结的单晶[100] MgO。这些结构由覆盖有不同厚度的超导NbN膜的Fe的[110]外延纳米片组成。S-F-S结构的特征在于对于面内和面外磁场的强磁阻（MR）各向异性。较强的面内MR表明S-F-S结的退相干，其临界电流分别对T_（Tc）和T<<Tc服从（1-T/Tc）~（1/2）关系，这与这种结中的超电流输运理论是一致的。
英文摘要：
We report an unconventional and promising route to self-assemble distributed superconductor-ferromagnet-superconductor (S-F-S) Josephson Junctions on single crystal [100] MgO. These structures consist of [110] epitaxial nano-plaquettes of Fe covered with superconducting NbN films of varying thickness. The S-F-S structures are characterized by strong magnetoresistance (MR) anisotropy for the in-plane and out-of-plane magnetic fields. The stronger in-plane MR suggests decoherence of S-F-S junctions whose critical current follows a (1-T/Tc) and (1-T/Tc)1/2 dependence for T Tc and T<<Tc respectively, in accordance with the theory of supercurrent transport in such junctions.
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