Analysis of two-magnon Raman scattering in quasi-one-dimensional chain antiferromagnet CsMnCl3 center dot 2H(2)O

The two-magnon Raman scattering obtained in CsMnCl3 . 2H(2)O was analyzed within a microscopic semi-phenomenological theory of the spin-dependent polarizability of exchange-coupled magnetic ions. Good agreement was obtained between observed and calculated polarization selection rules for two-magnon bands in the Raman spectra. It was shown that the nonevident selection rule for the observation of the two-particle peak-shape band originated mainly from magnons near the one-dimensional Brillouin zone boundary due to the specific zig-zag-type disposition of the Mn2+ ions in the chain structure.