Absorption and fluorescence study of an antiferromagnet with alternating strong and weak coupling : RbMnCl3

R. Moncorgé , B. Briat , J.C. Canit

The absorption spectrum of RbMnCl3 shows hot magnon satellites with frequencies of 75, 70 and 31 cm-1, and cold bands with frequences of 70, 65, 54 and 43 cm-1. The reduced zone boundary magnon energies (E/| J2 |) are expressed in terms of the ratio of the strong (J1) and weak (J2) exchange coupling constants. The fit of our experimental data leads to J 1/J2 ≃ 6 and J1 ≃ 26 cm-1, in serious disagreement with previous findings. Fluorescence measurements prove that optical excitations are completely localized.

Mots clés: antiferromagnetic properties of substances; Brillouin zones; exchange interactions electron; fluorescence; luminescence of inorganic solids; magnons; rubidium compounds; visible and ultraviolet spectra of inorganic solids

Domaines: Articles anciens

R. Moncorgé, B. Briat, J.C. Canit. Absorption and fluorescence study of an antiferromagnet with alternating strong and weak coupling : RbMnCl3. Journal de Physique, 1984, 45 (7), pp.1143-1148. ⟨10.1051/jphys:019840045070114300⟩. ⟨jpa-00209850⟩