Deisenhofer J.; Leonov I.; Eremin M.; Kant C.; Ghigna P.; Mayr F.; Iglamov V.; Anisimov V.; Van Der Marel D.
(2008)
We report on optical measurements of the 1D Heisenberg antiferromagnet KCuF3. The crystal-field excitations of the Cu2+ ions have been observed and their temperature dependence can be understood in terms of magnetic and ...