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

Gu, Qiangqiang; Wan, Siyuan; Tang, Qingkun; Du, Zengyi; Yang, Huan; Wang, Qiang -Hua; Zhong, Ruidan; Wen, Jinsheng; Gu, Genda D.; Wen, Hai -Hu

doi:10.1038/s41467-019-09340-5

Directly visualizing the sign change of d-wave superconducting gap in Bi₂Sr₂CaCu₂O_8+δ by phase-referenced quasiparticle interference

Journal Article · Mon Apr 08 00:00:00 EDT 2019 · Nature Communications

DOI:https://doi.org/10.1038/s41467-019-09340-5· OSTI ID:1508525

Gu, Qiangqiang ^[1]; Wan, Siyuan ^[1]; Tang, Qingkun ^[1]; Du, Zengyi ^[1]; ^[1]; Wang, Qiang -Hua ^[1]; Zhong, Ruidan ^[2]; ^[2]; ^[2]; Wen, Hai -Hu ^[1]

Nanjing Univ., Nanjing (China)
Brookhaven National Lab. (BNL), Upton, NY (United States)

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 Bi₂Sr₂CaCu₂O_8+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. Lastly, our results illustrate an effective way for determining the sign change of unconventional superconductors.

View Accepted Manuscript (DOE)

Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES); Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: SC0012704

OSTI ID:: 1508525

Report Number(s):: BNL--211575-2019-JAAM

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 10; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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