Magneto-caloric effect in the pseudo-binary intermetallic YPrFe17 compound

Álvarez, Pablo; Gorría, P.; Llamazares, J. L. Sánchez; Pérez, M.J.; Franco, V.; Reiffers, M.; Kováč, J.; Puente‐Orench, Inés; Blanco, J.A.

doi:10.1016/j.matchemphys.2011.09.062

Cited by 10 publications

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“…Values of S M ∼ −6 J(kgK) −1 under a magnetic field variation of H = 50 kOe are found around room temperature, for R = Pr or Nd compounds 15,30,34 and pseudobinary alloys where two different R elements are mixed. 43,44 Since studies of the magnetocaloric response in R 2 Fe 17 are scarce, we have performed a thorough investigation into the heavy rare-earth Er, which is expected to show its larger MCE around room temperature.…”

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Magnetovolume and magnetocaloric effects in Er2Fe17

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Combining different experimental techniques, investigations in hexagonal P 6 3 /mmc Er 2 Fe 17 show remarkable magnetovolume anomalies below the Curie temperature, T C . The spontaneous magnetostriction reaches 1.6 × 10 −2 at 5 K and falls to zero well above T C , owing to short-range magnetic correlations. Moreover, Er 2 Fe 17 exhibits direct and inverse magnetocaloric effects (MCE) with moderate isothermal magnetic entropy S M , and adiabatic temperature T ad changes [ S M ∼ −4.7 J(kgK) −1 and T ad ∼ 2.5 K near the T C , and S M ∼ 1.3 J(kgK)and T ad ∼ −0.6 K at 40 K for H = 80 kOe, respectively, determined from magnetization measurements].The existence of an inverse MCE seems to be related to a crystalline electric field-level crossover in the Er sublattice and the ferrimagnetic arrangement between the magnetic moments of the Er and Fe sublattice. The main trends found experimentally for the temperature dependence of S M and T ad as well as for the atomic magnetic moments are qualitatively well described considering a mean-field Hamiltonian that incorporates both crystalline electric field and exchange interactions. S M (T ) and T ad (T ) curves are essentially zero at ∼150 K, the temperature where the transition from direct to inverse MCE occurs. A possible interplay between the MCE and the magnetovolume anomalies is also discussed.

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