Abstract
The specific heat of DyNi 5 measured on a single-crystalline specimen in the temperature interval from 1.5 K to 250 K has been analyzed in terms of two electronic subsystems. The conduction-electron subsystem is characterized by a value of the Sommerfeld coefficient γ of 36 mJ/K 2 mol . The contribution of the rare-earth subsystem to the specific heat shows a λ-type of peak at T c and above T c a Schottky-type of peak. The rare-earth contribution is well described within a single-ion Hamiltonian that includes the CEF and exchange interactions of the R 3+ ions. The CEF interactions in ErNi 5 and DyNi 5 have been compared and a very similar charge multipolar distribution around the R 3+ ions is found. The energy level scheme of these Kramers ions with J = 15/2 is derived.
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