In Co4Nb2O9, a symmetry-only analysis of spin quadrupole moments at C3-symmetric Co sites reproduces the observed 2θ polarization rotation and predicts a new θ-rotation component and optical dichroism.
Here, a and b cor- respond to the A(up) and B(down) sites in the AF phase, respectively
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Symmetry Analysis of Magnetoelectric Effects in Honeycomb Antiferromagnet Co4Nb2O9
In Co4Nb2O9, a symmetry-only analysis of spin quadrupole moments at C3-symmetric Co sites reproduces the observed 2θ polarization rotation and predicts a new θ-rotation component and optical dichroism.