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We report the study of spin relaxation in the Eu1−xGdxB6 (0 ≤ x ≤ 0.039) single crystals with the help of 60 GHz electron spin resonance (ESR) technique. A drastic change in the linear slopes of the temperature dependences of the ESR linewidth is discovered in the paramagnetic phase of Eu1−xGdxB6. The corresponding crossover temperature T0 is shown to decrease from T0(x = 0) ∼ 60 K down to T0(x =...