Effect of spin fluctuations on the linewidth of 4f-electron transitions in Tm-YBCO compounds
Kovacevic Z. , Plakida N. M.
The sf interaction of the rare-earth ion Tm + with copper spins in Tm-YBCO compounds is analyzed. An expression is derived for the linewidth of transitions in the crystal electric field for Tm3+. Dynamic spin fluctuations in Cu02 dominate the line broadening.