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Abstract:
We report specific heat measurements on a CeAl2 single crystal between 0.02 and 1 K. Above 0.08 K, we found C0 = γT + βT3 with γ = (130±0.5) mJ/K2mole and β = (142±1) mJ/K4mole in good agreement with previous results above 0.3 K. Below 0.08 K, an excess specific heat CN = αT−2 with α = (6.4±1) mJK/mole was detected and interpreted in terms of hyperfine splitting of the Al27 nuclear states. Our results suggest that in CeAl2 (complex) antiferromagnetism coexists with the Kondo effect at least down to 20 mK.