Interplay of hidden orbital order and superconductivity in CeCoIn5

Weijiong Chen, Clara Neerup Breiø, Freek Massee, Milan P. Allan, ‪Cedomir Petrovic, J. C. Séamus Davis (), Peter J. Hirschfeld, Brian M. Andersen () and Andreas Kreisel
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Weijiong Chen: University of Oxford
Clara Neerup Breiø: University of Copenhagen
Freek Massee: Laboratoire de Physique des Solides (CNRS UMR 8502), Bâtiment 510, Université Paris-Sud/Université Paris-Saclay
Milan P. Allan: Leiden University
‪Cedomir Petrovic: Brookhaven National Laboratory
J. C. Séamus Davis: University of Oxford
Peter J. Hirschfeld: University of Florida
Brian M. Andersen: University of Copenhagen
Andreas Kreisel: University of Copenhagen

Nature Communications, 2023, vol. 14, issue 1, 1-7

Abstract: Abstract Visualizing atomic-orbital degrees of freedom is a frontier challenge in scanned microscopy. Some types of orbital order are virtually imperceptible to normal scattering techniques because they do not reduce the overall crystal lattice symmetry. A good example is dxz/dyz (π,π) orbital order in tetragonal lattices. For enhanced detectability, here we consider the quasiparticle scattering interference (QPI) signature of such (π,π) orbital order in both normal and superconducting phases. The theory reveals that sublattice-specific QPI signatures generated by the orbital order should emerge strongly in the superconducting phase. Sublattice-resolved QPI visualization in superconducting CeCoIn5 then reveals two orthogonal QPI patterns at lattice-substitutional impurity atoms. We analyze the energy dependence of these two orthogonal QPI patterns and find the intensity peaked near E = 0, as predicted when such (π,π) orbital order is intertwined with d-wave superconductivity. Sublattice-resolved superconductive QPI techniques thus represent a new approach for study of hidden orbital order.

Date: 2023
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DOI: 10.1038/s41467-023-38760-7

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