Zhu J X, Ting C S
Texas Center for Superconductivity, University of Houston, Houston, Texas 77204, USA.
Phys Rev Lett. 2001 Oct 1;87(14):147002. doi: 10.1103/PhysRevLett.87.147002. Epub 2001 Sep 18.
The local density of states (LDOS) at the vortex lattice cores in a high- T(c) superconductor is studied by using a self-consistent mean-field theory including interactions for both antiferromagnetism (AF) and d-wave superconductivity (DSC). In a zero-field optimally doped sample the AF order is completely suppressed while DSC prevails. In the mixed state, we show that the local AF-like spin density wave order appears near the vortex core and acts as an effective local magnetic field on electrons via Zeeman coupling. As a result, the LDOS at the core exhibits a double-peak structure near the Fermi level that is in good agreement with recent scanning tunneling microscopy observations.
利用包含反铁磁性（AF）和d波超导（DSC）相互作用的自洽平均场理论，研究了高温超导体中涡旋晶格核心处的局域态密度（LDOS）。在零场最佳掺杂样品中，AF序被完全抑制，而DSC占主导。在混合态中，我们表明类似AF的局域自旋密度波序出现在涡旋核心附近，并通过塞曼耦合对电子起有效局域磁场的作用。结果，核心处的LDOS在费米能级附近呈现双峰结构，这与最近的扫描隧道显微镜观测结果吻合良好。
