부산대학교 도서관

CeCu4Al and CeCu2Zn2Al are heavy-fermion systems with extremely enhanced C/T (the specific heat divided by temperature) values of 2.3 and 1.8 J/K2, respectively, as T>0 K. The field dependence of the low-temperature specific heat is also extreme: At 11 T, C of CeCu4Al is reduced by more than a factor of 5 and at 12.5 T, C of CeCu2Zn2Al is suppressed by a factor of about 7. Magnetic-field-caused changes of the specific heat of CeCu4Al are consistent with a single-ion Kondo model. Magnetic correlations are at least partially responsible for the enhanced low-temperature specific heat of CeCu2Zn2Al. © 1991 The American Physical Society.