NMR Studies of Magnetic Vortex Cores of Type-II Superconductors

我们从原位核磁共振和非原位核磁共振的角度发展了选择性核磁共振技术来研究II型超导体混合态涡旋核内量子干涉束缚态的局域磁性。我们发现了Ca_2-xNa_xCuO_2Cl_2的非均匀磁相关，Hg1223超导跃迁时的磁分异现象，以及Bi2212在T_c以下的宽NQR谱中自旋相关的频率分布。

We have developed site-selective NMR techniques from the viewpoints of In-situ and Ex-situ NMR to study the local magnetism of quantum interference bound states inside vortex cores in the mixed states of type II superconductors.We found the inhomogeneous magnetic correlation of Ca_2-xNa_xCuO_2Cl_2, a magnetic differentiation phenomenon at the superconducting transition for Hg1223, and frequency distribution of spin correlation in the broad NQR spectrum of Bi2212 below T_c.