Two-Exciton Transitions in Mnand RbMn
- 1 November 1971
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 4 (9), 3141-3152
- https://doi.org/10.1103/physrevb.4.3141
Abstract
Absorption lines corresponding to the simultaneous creation of two excitons have been investigated in Mn and RbMn. The particular zero-phonon transitions observed are those from the ground states of a Mn ion pair to the , , , and excited states in Mn and to the , , , and , , states in RbMn. An attempt is made to identify the particular excitons created in these transitions through their polarizations and uniaxial stress behavior. Selection rules are derived using the space-group representations along with the additional assumption that the transition mechaanism is an off-diagonal exchange interaction between pairs of Mn ions on opposite magnetic sublattices. The interaction between excitons is discussed; it is found experimentally that for those excitons which couple strongly to the lattice, the phonon coupling provides the major part of the interaction. The exciton-exciton interaction energy is positive or negative and varies from 10 to 400...
Keywords
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