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Atomic-scale visualization of surface-assisted orbital order.

Howon Kim1, Yasuo Yoshida1, Chi-Cheng Lee2,3

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Summary
This summary is machine-generated.

Researchers imaged orbital ordering on a CeCoIn5 surface, revealing staggered cobalt atom arrangements. This surface-assisted orbital order, driven by Coulomb interactions, offers new insights into condensed matter physics.

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Area of Science:

  • Condensed Matter Physics
  • Surface Science
  • Materials Science

Background:

  • Orbital-related physics is a key area in condensed matter research.
  • Direct real-space imaging of orbital degrees of freedom remains a significant challenge.
  • The heavy fermion compound CeCoIn5 is a well-studied material with potential for novel electronic properties.

Purpose of the Study:

  • To achieve the first real-space imaging of a surface-assisted orbital ordered structure.
  • To investigate the nature of orbital ordering on a cobalt-terminated surface of CeCoIn5.
  • To understand the underlying mechanisms driving the observed surface structure.

Main Methods:

  • Scanning Tunneling Microscopy (STM) was employed for real-space imaging of the CeCoIn5 surface.
  • First-principles calculations were performed to interpret the experimental observations and elucidate the electronic structure.

Main Results:

  • STM topographies revealed cobalt atoms forming dumbbell shapes on the cleaved (001) surface at small tip-sample distances.
  • These dumbbell shapes were alternatingly aligned along the [100] and [010] directions, indicating a specific surface structure.
  • Calculations confirmed this structure arises from staggered d-d orbital ordering, enhanced by surface Coulomb interactions.

Conclusions:

  • A novel surface-assisted orbital ordered structure has been directly imaged in real space on CeCoIn5.
  • Enhanced on-site Coulomb interaction at the surface drives the staggered d-d orbital order.
  • This overlooked phenomenon may be prevalent in other materials like transition metal oxides and heavy fermion superconductors.