Abstract
The c-axis tunneling matrix of high- superconductors is shown to depend strongly on the in-plane momentum of electrons and vanish along the four nodal lines of the -wave energy gap. This anisotropic tunneling matrix suppresses completely the contribution of the most extended quasiparticles in the vortex core to the c-axis tunneling current and leads to a spectrum similar to that of a nodeless superconductor. Our results give a natural explanation of the absence of the zero-bias peak as well as other features observed in the vortex tunneling spectra of high- cuprates.
- Received 20 July 2000
DOI:https://doi.org/10.1103/PhysRevB.62.14427
©2000 American Physical Society