SHG in CoF2 is shown to be sensitive to the ferroic-octupolar magnetic order parameter in the altermagnetic phase via resonant three-photon processes and symmetry-allowed quadrupolar polarization.
Adler, Nonlinear optical frequency polarization in a dielectric, Phys
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Nonlinear Optical Probing of Ferroic-Octupolar Order Parameter in Collinear Altermagnet
SHG in CoF2 is shown to be sensitive to the ferroic-octupolar magnetic order parameter in the altermagnetic phase via resonant three-photon processes and symmetry-allowed quadrupolar polarization.