Loss of magnetism in CePd2−xNixAl3

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Abstract

Hexagonal CePd2−xNixAl3 exhibits a crossover from a Kondo lattice showing magnetic order at TN≃2.8K for x⩽0.2 to intermediate valence (IV) for x→2. Though TN(x) is weakly affected upon Pd/Ni substitution before vanishing at finite temperature, the Kondo temperature TK progressively increases. Above x≃0.3 the phase boundary no longer exists and strong spin fluctuations cause pronounced deviations from a Fermi-liquid ground state before the IV regime is established for x⩾1.

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