APPROACH OF THE STATE FROM ANTIFERROMAGNETIC TO HEAVY-FERMION IN CEIN(AG1-XCUX)(2) UNDER PRESSURE

The electrical resistivity has been studied in the Heusler alloy syste m CeIn(Cu1-xAgx)(2) under pressure up to 20 kbar. Under pressure, the Neel temperature, T-N, decreases for x = 0.75 and 0.85 but increases f or x = 0.50. T-max (resistivity maximum temperature) decreases for x = 0.50 and 0.75 while for x = 0.85 it increases above 10 kbar. These re sults are analyzed and discussed according to Doniach's Kondo-necklace model. The result shows that the system approaches to the pure heavy- fermion state (for x = 0.75 and 0.85) while it approaches to the manif ested antiferromagnetic state (for x = 0.50) due to the pressure-induc ed hybridization. (C) 1998 Elsevier Science B.V. All rights reserved.