Second harmonic generation in the centrosymmetric antiferromagnet NiO |
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Authors: | Fiebig M Fröhlich D Lottermoser T Pavlov V V Pisarev R V Weber H J |
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Affiliation: | Institut für Physik, Universit?t Dortmund, 44221 Dortmund, Germany. |
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Abstract: | In spite of the fact that inversion is a symmetry operation of both the crystalline and the magnetic lattice of NiO, second harmonic generation (SHG) has been observed below the Néel temperature. A spectroscopic study shows that the signal is due to combined magnetic-dipole and electric-dipole transitions between the (3d)(8) levels of the Ni(2+) ion in the crystal field. The SHG is resonant in both the incoming and the outgoing light waves and thus greatly enhanced. A quadratic coupling of the nonlinear polarization to the order parameter was found. This allows the investigation of individual domains. |
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