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Directly visualizing the sign change of d-wave superconducting gap in Bi2Sr2CaCu2O8+δ by phase-referenced quasiparticle interference.

Abstract：

:The superconducting state is formed by the condensation of Cooper pairs and protected by the superconducting gap. The pairing interaction between the two electrons of a Cooper pair determines the gap function. Thus, it is pivotal to detect the gap structure for understanding the mechanism of superconductivity. In cuprate superconductors, it has been well established that the gap may have a d-wave function. This gap function has an alternative sign change in the momentum space. It is however hard to visualize this sign change. Here we report the measurements of scanning tunneling spectroscopy in Bi2Sr2CaCu2O8+δ and conduct the analysis of phase-referenced quasiparticle interference (QPI). We see the seven basic scattering vectors that connect the octet ends of the banana-shaped contour of Fermi surface. The phase-referenced QPI clearly visualizes the sign change of the d-wave gap. Our results illustrate an effective way for determining the sign change of unconventional superconductors.

journal_name

Nat Commun

journal_title

Nature communications

authors

Gu Q,Wan S,Tang Q,Du Z,Yang H,Wang QH,Zhong R,Wen J,Gu GD,Wen HH

doi

10.1038/s41467-019-09340-5

subject

Has Abstract

pub_date

2019-04-08 00:00:00

pages

1603

issue

1

issn

2041-1723

pii

10.1038/s41467-019-09340-5

journal_volume

10

pub_type

杂志文章

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