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. Lastly, our results illustrate an effective way for determining the sign change of unconventional superconductors.
- Authors:
-
[1];
[2];
[2];
- Nanjing Univ., Nanjing (China)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Publication Date:
- Research Org.:
- Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES); Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1508525
- Report Number(s):
- BNL-211575-2019-JAAM
Journal ID: ISSN 2041-1723
- Grant/Contract Number:
- SC0012704
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature Communications
- Additional Journal Information:
- Journal Volume: 10; Journal Issue: 1; Journal ID: ISSN 2041-1723
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Gu, Qiangqiang, Wan, Siyuan, Tang, Qingkun, Du, Zengyi, Yang, Huan, Wang, Qiang -Hua, Zhong, Ruidan, Wen, Jinsheng, Gu, Genda D., and Wen, Hai -Hu. Directly visualizing the sign change of d-wave superconducting gap in Bi2Sr2CaCu2O8+δ by phase-referenced quasiparticle interference. United States: N. p., 2019.
Web. doi:10.1038/s41467-019-09340-5.
Gu, Qiangqiang, Wan, Siyuan, Tang, Qingkun, Du, Zengyi, Yang, Huan, Wang, Qiang -Hua, Zhong, Ruidan, Wen, Jinsheng, Gu, Genda D., & Wen, Hai -Hu. Directly visualizing the sign change of d-wave superconducting gap in Bi2Sr2CaCu2O8+δ by phase-referenced quasiparticle interference. United States. https://doi.org/10.1038/s41467-019-09340-5
Gu, Qiangqiang, Wan, Siyuan, Tang, Qingkun, Du, Zengyi, Yang, Huan, Wang, Qiang -Hua, Zhong, Ruidan, Wen, Jinsheng, Gu, Genda D., and Wen, Hai -Hu. Mon .
"Directly visualizing the sign change of d-wave superconducting gap in Bi2Sr2CaCu2O8+δ by phase-referenced quasiparticle interference". United States. https://doi.org/10.1038/s41467-019-09340-5. https://www.osti.gov/servlets/purl/1508525.
@article{osti_1508525,
title = {Directly visualizing the sign change of d-wave superconducting gap in Bi2Sr2CaCu2O8+δ by phase-referenced quasiparticle interference},
author = {Gu, Qiangqiang and Wan, Siyuan and Tang, Qingkun and Du, Zengyi and Yang, Huan and Wang, Qiang -Hua and Zhong, Ruidan and Wen, Jinsheng and Gu, Genda D. and Wen, Hai -Hu},
abstractNote = {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. Lastly, our results illustrate an effective way for determining the sign change of unconventional superconductors.},
doi = {10.1038/s41467-019-09340-5},
journal = {Nature Communications},
number = 1,
volume = 10,
place = {United States},
year = {Mon Apr 08 00:00:00 EDT 2019},
month = {Mon Apr 08 00:00:00 EDT 2019}
}
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