Kavli Affiliate: J. C. Seamus Davis
| First 5 Authors: Weijiong Chen, Clara Neerup Breiø, Freek Massee, M. P. Allan, C. Petrovic
| Summary:
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 ({pi},{pi}) orbital order in
tetragonal lattices. For enhanced detectability, here we consider the
quasiparticle scattering interference (QPI) signature of such ({pi},{pi})
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 ({pi}) orbital order is inte,{pi}rtwined
with d-wave superconductivity. Sublattice-resolved superconductive QPI
techniques thus represent a new approach for study of hidden orbital order.
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