Magnetic couplings and magnetocaloric effect in the GdTX (T=Sc, Ti, Co, Fe; X=Si, Ge) compounds

Journal of Physics. Condensed Matter : an Institute of Physics Journal
Daniel J GarcíaPablo S Cornaglia

Abstract

We compute the magnetocaloric effect (MCE) in the GdTX (T = Sc, Ti, Co, Fe; X = Si, Ge) compounds as a function of the temperature and the external magnetic field. To this end we use a density functional theory approach to calculate the exchange-coupling interactions between Gd3+ ions on each compound. We consider a simplified magnetic Hamiltonian and analyze the dependence of the exchange couplings on the transition metal T, the p-block element X, and the crystal structure (CeFeSi-type or CeScSi-type). The most significant effects are observed for the replacements Ti → Sc or Fe → Co which have an associated change in the parity of the electron number in the three dimensional level. These replacements lead to an antiferromagnetic contribution to the magnetic couplings that reduces the Curie temperature and can even lead to an antiferromagnetic ground state. We solve the magnetic models through mean field and Monte Carlo calculations and find large variations among compounds in the magnetic transition temperature and in the magnetocaloric effect, in agreement with the available experimental data. The magnetocaloric effect shows a universal behavior as a function of temperature and magnetic field in the ferromagnetic compounds af...Continue Reading

References

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Oct 28, 1996·Physical Review Letters·J P PerdewM Ernzerhof
May 30, 2012·Journal of the American Chemical Society·Eduard CremadesEliseo Ruiz
Nov 10, 2017·Journal of Physics. Condensed Matter : an Institute of Physics Journal·F GuillouV K Pecharsky
Aug 24, 2018·Journal of the American Chemical Society·Xi-Ming LuoYan Xu

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