Positive and negative magnetocaloric effects in CeSi

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We present a study of the magnetocaloric effect (MCE) in the commensurate antiferromagnet CeSi. We show that the MCE exhibits both positive and negative components, the former indicative of a magnetic configurational entropy increases upon isothermal magnetisation. We describe the Hamiltonian of the system as a simple model antiferromagnetic Hamiltonian where spins are ferromagnetically aligned in the ac-plane, while planes are weakly antiferromagnetically coupled along the b-axis (consistent with μSR experimental results). We show that reproduces both the positive and the negative MCE for applied fields up to 30 kOe, while in larger fields the magnitude of the negative component (indicative of an overall suppression of magnetic configurational entropy) is larger than expected from our model.

Original languageEnglish
Article number17A903
JournalJournal of Applied Physics
Issue number17
Publication statusPublished - 7 May 2013

ASJC Scopus subject areas

  • General Physics and Astronomy


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