Mechanisms of exciton–magnon absorption of light by the two-sublattice noncollinear antiferromagnet CoCO3
A. VerdyanPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kovV. V. EremenkoPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kovN. KanerPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kovYu. G. LitvinenkoPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kovV. V. ShapiroPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kov
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The region from 16,000 to 26,000 cm−1 of the light absorption spectrum of the antiferromagnet CoCO3 was studied in external magnetic fields of up to 300 kOe at temperatures of 1.8 to 35 °K. The electronic transitions in the frequency range studied were identified and the fine structure of the 4Γ4−2Γ4 transition was examined in detail. After investigating the mechanisms of exciton–magnon light absorption in CoCO3 we found values of 33.5 and 22.5 cm−1 for the spin-wave energies at the Brillouin zone boundary.
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