1999/10/19 by Debanand Sa, D. Sa, R. Valentí +2 · 1 citation
Materials Science · Physics and Astronomy · #Heusler alloys: electronic and magnetic properties #High harmonic generation #Homogeneous space #Magnetic susceptibility #Multiferroics and related materials #Phase (matter) #Second-harmonic generation #Symmetry (geometry) #Symmetry group #Tensor (intrinsic definition) #Topological Materials and Phenomena #cond-mat
paper · pdf · doi:10.1007/s100510050133
published as Eur. Phys. J. B 14, 301-305 (2000) · European Journal of Physics B (accepted)
arxiv created 1999/10/19 · openalex publication_date 2000/03/01 · openalex created_date 2016/06/24 · arxiv updated 2016/08/31 · openalex updated_date 2026/08/05
We develop a generalized Ginzburg-Landau theory for second harmonic generation (SHG) in magnets by expanding the free energy in terms of the order parameter in the magnetic phase and the susceptibility tensor in the corresponding high-temperature phase. The non-zero components of the SHG susceptibility in the ordered phase are derived from the symmetries of the susceptibility tensor in the high-temperature phase and the symmetry of the order parameter. In this derivation, the dependence of the SHG susceptibility on the order parameter follows naturally, and therefore its nonreciprocal optical properties. We examine this phenomenology for the magnetoelectric compound Cr2O3 as well as for the ferroelectromagnet YMnO3.