Peculiarities of exciton–magnon absorption of light by antiferromagnetic CsMnCI3 · 2H2O due to the low dimensionality of its magnetic structure

The transition 6Alg(6S) → 4T2(4D) in the optical light absorption spectrum of CsMnCl3 · 2H2O, which has the best developed fine structure, is investigated experimentally. Peculiarities of exciton–magnon light absorption, stemming from the one-dimensionality of the crystal and absent in spectra of three-dimensional antiferromagnetic crystals, are discovered. The exciton–magnon absorption has a clearly expressed band nature. In the region of the exciton line, fine structure of the exciton–magnon absorption is observed in the form of two narrow bands. It turns out that it is possible to observe directly in the hot exciton–magnon absorption spectrum the position of the maxima of the initial segment of the magnon density of states and to measure the activation energy of both branches of the spin-wave spectrum of CsMnCl3 · 2H2O.

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