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Atomically-resolved interlayer charge ordering and its interplay with superconductivity in YBa2Cu3O6.81.

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|June 24, 2021
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High-temperature superconductive cuprates show competing charge order (CO) nanodomains within the superconductive phase. This proximity effect suppresses both orders at their boundaries, impacting superconductivity mechanisms.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • High-temperature cuprates feature superconductive and competing charge order (CO) phases.
  • Understanding the interplay between CO and superconductivity is crucial for elucidating superconductivity mechanisms.

Purpose of the Study:

  • To directly image the spatial relationship between charge order and superconductivity in YBa2Cu3O6.81 at atomic resolution.
  • To investigate interlayer coupling effects in both charge order and superconductive states.

Main Methods:

  • Cryogenic cleavage of YBa2Cu3O6.81 samples.
  • Cross-sectional scanning tunneling microscopy/spectroscopy (STM/STS) for atomic-scale imaging.

Main Results:

  • Charge order nanodomains are observed embedded within the superconductive phase.
  • A proximity-like boundary region shows mutual suppression of charge order and superconductivity.
  • Superconductivity and charge order coexist on both CuO chain and plane layers, indicating inter-layer coupling.

Conclusions:

  • Charge order nanodomains influence superconductivity through proximity effects.
  • Interlayer carrier transport and density of states mixing are significant.
  • Coulomb repulsion likely dominates Josephson tunneling between layers in the charge ordered state.