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Title: Cooper Pair Density of Bi 2Sr 2CaCu 2O 8+x in Atomic scale at 4.2 K

Abstract

In pursuit of the elusive mechanism of high-T C superconductors (HTSC), spectroscopic imaging scanning tunneling microscopy (SI-STM) is an indispensable tool for surveying local properties of HTSC. Since a conventional STM utilizes metal tips, which allow the examination of only quasiparticles and not superconducting (SC) pairs, Josephson tunneling using STM has been demonstrated by many authors in the past. An atomically resolved scanning Josephson tunneling microscopy (SJTM), however, was realized only recently on Bi 2Sr 2CaCu 2O 8+x (Bi-2212) below 50 mK and on the Pb(110) surface at 20 mK. Here we report the atomically resolved SJTM on Bi 2Sr 2CaCu 2O 8+x at 4.2 K using Bi-2212 tips created in situ. The I-V characteristics show clear zero bias conductance peaks following Ambegaokar-Baratoff (AB) theory. A gap map was produced for the first time using an atomically resolved Josephson critical current map I C(r) and AB theory. Surprisingly, we found that this new gap map is anticorrelated to the gap map produced by a conventional method relying on the coherence peaks. Quasiparticle resonance due to a single isolated zinc atom impurity was also observed by SJTM, indicating that atomically resolved SJTM was achieved at 4.2 K. Lastly, our result providesmore » a starting point for realizing SJTM at even higher temperatures, rendering possible investigation of the existence of SC pairs in HTSC above the T C.« less

Authors:
ORCiD logo [1];  [1];  [1];  [1];  [1];  [2];  [1]
  1. Seoul National Univ. (SNU), Seoul (Republic of Korea); Center for Correlated Electron Systems, Seoul (Republic of Korea). Inst. for Basic Science (IBS)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1504372
Report Number(s):
BNL-211487-2019-JAAM
Journal ID: ISSN 1530-6984
Grant/Contract Number:  
SC0012704
Resource Type:
Accepted Manuscript
Journal Name:
Nano Letters
Additional Journal Information:
Journal Volume: 19; Journal Issue: 2; Journal ID: ISSN 1530-6984
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; High-temperature superconductor; Josephson effect; STM

Citation Formats

Joo, S. H., Kim, J. -J., Yoo, J. H., Park, M. S., Lee, K. S., Gu, G., and Lee, Jinho. Cooper Pair Density of Bi2Sr2CaCu2O8+x in Atomic scale at 4.2 K. United States: N. p., 2019. Web. doi:10.1021/acs.nanolett.8b04415.
Joo, S. H., Kim, J. -J., Yoo, J. H., Park, M. S., Lee, K. S., Gu, G., & Lee, Jinho. Cooper Pair Density of Bi2Sr2CaCu2O8+x in Atomic scale at 4.2 K. United States. doi:10.1021/acs.nanolett.8b04415.
Joo, S. H., Kim, J. -J., Yoo, J. H., Park, M. S., Lee, K. S., Gu, G., and Lee, Jinho. Wed . "Cooper Pair Density of Bi2Sr2CaCu2O8+x in Atomic scale at 4.2 K". United States. doi:10.1021/acs.nanolett.8b04415.
@article{osti_1504372,
title = {Cooper Pair Density of Bi2Sr2CaCu2O8+x in Atomic scale at 4.2 K},
author = {Joo, S. H. and Kim, J. -J. and Yoo, J. H. and Park, M. S. and Lee, K. S. and Gu, G. and Lee, Jinho},
abstractNote = {In pursuit of the elusive mechanism of high-TC superconductors (HTSC), spectroscopic imaging scanning tunneling microscopy (SI-STM) is an indispensable tool for surveying local properties of HTSC. Since a conventional STM utilizes metal tips, which allow the examination of only quasiparticles and not superconducting (SC) pairs, Josephson tunneling using STM has been demonstrated by many authors in the past. An atomically resolved scanning Josephson tunneling microscopy (SJTM), however, was realized only recently on Bi2Sr2CaCu2O8+x (Bi-2212) below 50 mK and on the Pb(110) surface at 20 mK. Here we report the atomically resolved SJTM on Bi2Sr2CaCu2O8+x at 4.2 K using Bi-2212 tips created in situ. The I-V characteristics show clear zero bias conductance peaks following Ambegaokar-Baratoff (AB) theory. A gap map was produced for the first time using an atomically resolved Josephson critical current map IC(r) and AB theory. Surprisingly, we found that this new gap map is anticorrelated to the gap map produced by a conventional method relying on the coherence peaks. Quasiparticle resonance due to a single isolated zinc atom impurity was also observed by SJTM, indicating that atomically resolved SJTM was achieved at 4.2 K. Lastly, our result provides a starting point for realizing SJTM at even higher temperatures, rendering possible investigation of the existence of SC pairs in HTSC above the TC.},
doi = {10.1021/acs.nanolett.8b04415},
journal = {Nano Letters},
number = 2,
volume = 19,
place = {United States},
year = {2019},
month = {1}
}

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This content will become publicly available on January 30, 2020
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