Heat Capacity of Heavy Fermion Compound CeCu4Ga in High Magnetic Fields
A. Kowalczyk a, T. Toliński a, M. Reiffers b, M. Zapotoková b, M. Falkowski a and E. Gažo b
a Institute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland,
b Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 043 53 Košice, Slovakia
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The heat capacity in the applied magnetic field up to 9 T, susceptibility and magnetization of polycrystalline CeCu4Ga are presented. Magnetic ordering was not observed down to 2 K. For temperature T < 200 K a Curie-Weiss behavior is observable giving an effective magnetic moment μeff =2.53 μB/f.u. The experimental value of μeff is close to the calculated one for a free Ce3+ ion (μeff = 2.54 μB/f.u.), thus indicating the presence of well localized magnetic moments carried by the stable Ce3+ ions. At low temperatures the electronic heat capacity coefficient value depends strongly on the temperature range used for the extrapolation and applied magnetic field. We observe a typical heavy fermion behavior with γ value of about 380 mJ mol-1 K-2 obtained from extrapolation to T = 0 K of the temperature range above 7 K. However, extrapolation of the lowest temperatures range yields the γ value of 3.3 J mol-1 K-2.
DOI: 10.12693/APhysPolA.115.123
PACS numbers: 65.40.Ba, 71.20.Eh, 71.27.+a