ESR investigation of the spin dynamics in (Gd_{1-x}Y_{x})_2PdSi_{3}
  We report electron-spin resonance measurements in polycrystalline samples of (Gd_{1-x}Y_{x})_2PdSi_{3}. We observe the onset of a broadening of the linewidth and of a decrease of the resonance field at approximately twice the Neel temperature in the paramagnetic state, this characteristic temperature coincides with the electrical resistivity minimum. The high-temperature behaviour of the linewidth is governed by a strong bottleneck effect. 
J. Deisenhofer, H.-A. Krug von Nidda, A. Loidl, E.V. Sampathkumaran