We have measured the magnetization and ac susceptibility of single-crystalline Ce0.69Lu0.31B2C2. Some features of a spin-glass state were found in the irreversibility between the zero-field-cooled and the field-cooled magnetizations under magnetic fields between 5 and 55 mT in the temperature range from 2 to 10 K and the frequency dependence of the real and imaginary parts of the ac susceptibility (χ′ and χ″). The results indicate the occurrence of a spin-glass transition in Ce0.69Lu0.31B2C2. We suppose the spin-glass behaviour of Ce0.69Lu0.31B2C2 to originate from frustration of magnetic interactions in this compound.
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