Cooper Pair Density of Bi2Sr2CaCu2O8+x in Atomic scale at 4.2 K

Joo, S. H.; Kim, J. -J.; Yoo, J. H.; Park, M. S.; Lee, K. S.; Gu, G.; Lee, Jinho

doi:10.1021/acs.nanolett.8b04415

Title: Cooper Pair Density of Bi₂Sr₂CaCu₂O_8+x in Atomic scale at 4.2 K

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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 Bi₂Sr₂CaCu₂O_8+x (Bi-2212) below 50 mK and on the Pb(110) surface at 20 mK. Here we report the atomically resolved SJTM on Bi₂Sr₂CaCu₂O_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 provides a starting point for realizing SJTM at even higher temperatures,more »« less

Authors:

^[1]; Kim, J. -J. ^[1]; Yoo, J. H. ^[1]; Park, M. S. ^[1]; Lee, K. S. ^[1]; Gu, G. ^[2]; Lee, Jinho ^[1]

Seoul National Univ. (SNU), Seoul (Republic of Korea); Center for Correlated Electron Systems, Seoul (Republic of Korea). Inst. for Basic Science (IBS)
Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.

Publication Date:: Wed Jan 30 00:00:00 EST 2019

Research Org.:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

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.

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                    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.  https://doi.org/10.1021/acs.nanolett.8b04415

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                    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.  https://doi.org/10.1021/acs.nanolett.8b04415.  https://www.osti.gov/servlets/purl/1504372.

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@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         = {Wed Jan 30 00:00:00 EST 2019},

  month        = {Wed Jan 30 00:00:00 EST 2019}

}

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Title: Cooper Pair Density of Bi2Sr2CaCu2O8+x in Atomic scale at 4.2 K

Abstract

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Title: Cooper Pair Density of Bi₂Sr₂CaCu₂O_8+x in Atomic scale at 4.2 K