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Absence of the zero bias peak in vortex tunneling spectra of high temperature superconductors?

Congjun Wu·Tao Xiang·Zhao-Bin Su
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Abstract

The c-axis tunneling matrix of high-Tc superconductors is shown to depend strongly on the in-plane momentum of electrons and vanish along the four nodal lines of the d(x^2-y^2)-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-Tc cuprates.

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Congjun Wu, Tao Xiang, Zhao-Bin Su. 2000-09-25. Absence of the zero bias peak in vortex tunneling spectra of high temperature superconductors?. https://doi.org/10.1103/physrevb.62.14427

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