PrNiGe2 crystallizes in the orthorhombic CeNiSi2-type crystal structure and is known to order ferromagnetically below 13 K. The emergence of ferromagnetic order has been understood in terms of a crystalline electric field (CEF) Hamiltonian dominated by O0n-Stevens operator equivalents. However, a recent calculation points out that the O22-terms are important in this system. Here a study of the magnetocaloric effect (MCE) of PrNiGe2 is presented. The aim of the study is to investigate the origin of long range ferromagnetic order given the presence of the above-mentioned CEF. We find that the interplay between a dominant CEF-energy scale and a weaker exchange interaction results in the formation of a ferromagnetic ground state in this system.

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