Eremin M.; Deisenhofer J.; Fayzullin M.; Kant C.; Loidl A.
(2011)
We propose a new mechanism of exciton-magnon absorption in the 1D Heisenberg antiferromagnet KCuF3. It yields the correct description of the relative intensity of the spectral lines in both polarizations E⊥ c and E∥c. The ...