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VOLUME 57 (1993) | ISSUE 4 | PAGE 238
Effect of spin fluctuations on the linewidth of 4f-electron transitions in Tm-YBCO compounds
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.