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CeCu4Al and CeCu2Zn2A1: Very-heavy-fermion systems in high magnetic fields

CeCu4A1 and CeCu2Zn2A1 are heavy-fermion systems with extremely enhanced C/T (the specific heat divided by temperature) values of 2. 3 and 1. 8 J/K, respectively, as T~O K. The field dependence of the low-temperature specific heat is also extreme: At 11 T, C of CeCu4A1 is reduced by more than a factor of 5 and at 12. 5 T, C of CeCu2Zn2A1 is suppressed by a factor of about 7. Magnetic-field-caused changes of the specific heat of CeCu4A1 are consistent with a single-ion Kondo model. Magnetic correlations are at least partially responsible for the enhanced low-temperature specific heat of CeCu2Zn2A1.