Heliyon (Jan 2019)

On the deviation from a Curie–Weiss behavior of the ZnFe2O4 susceptibility: A combined ab-initio and Monte-Carlo approach

  • J. Melo Quintero,
  • K.L. Salcedo Rodríguez,
  • F.A. Gómez Albarracín,
  • H.D. Rosales,
  • P. Mendoza Zélis,
  • S.J. Stewart,
  • L.A. Errico,
  • C. Rodríguez Torres

Journal volume & issue
Vol. 5, no. 1
p. e01170

Abstract

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We present a numerical study of the magnetic properties of ZnFe2O4 using Monte-Carlo simulations performed considering a Heisenberg model with antiferromagnetic couplings determined by Density Functional Theory. Our calculations predict that the magnetic susceptibility has a cusp-like peak centered at 13 K, and follows a Curie–Weiss behavior above this temperature with a high and negative Curie–Weiss temperature (ΘCW=−170 K). These results agree with the experimental data once extrinsic contributions that give rise to the deviation from a Curie–Weiss law are discounted. Additionally, we discuss the spin configuration of ZnFe2O4 below its ordering temperature, where the system presents a high degeneracy.

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