Vortex charges in high-temperature superconductors |
| |
Authors: | Chen Yan Wang Z D Zhu Jian-Xin Ting C S |
| |
Institution: | Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, Texas 77204, USA. |
| |
Abstract: | Based on a model Hamiltonian with competing antiferromagnetic (AF) and d-wave superconductivity interactions, the vortex charge is investigated by solving the Bogoliubov-de Gennes equations. We found that the vortex charge is negative when a sufficient strength of AF order is induced inside the vortex core; otherwise, it is positive. By tuning the on-site Coulomb repulsion U or the doping parameter delta, a transition between the positive and negative vortex charges may occur. The vortex charge at optimal doping has also been studied as a function of magnetic field. Recent NMR and Hall effect experiments may be understood in terms of the present results. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|