On the magnetocaloric effect in Gd(Zn1−xCdx)

Gomes, M.B.; Oliveira, N.A. de

doi:10.1016/j.ssc.2005.12.019

Cited by 4 publications

(1 citation statement)

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“…In this series, compounds formed with light lanthanides are antiferromagnets, whereas those formed with heavy lanthanides are ferromagnets whose Curie temperatures (T C 's) lie between 269 and 17 K. [17][18][19] Some magnetic, calorimetric, and magnetoelastic properties of the RZn compounds are reported in the literature, [18][19][20][21][22][23] but few works have explored the MCE in this series. 16,24,25 The aim of this work is to investigate the magnetocaloric properties of HoZn and ErZn. HoZn presents a first-order spontaneous reorientation transition (SRT) and its magnetization discontinuously rotates from the h110i direction toward the h111i one, as temperature increases at T 1 ¼ 23 K. ErZn exhibit large magnetoelastic effects.…”

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confidence: 99%

The influence of spontaneous and field-induced spin reorientation transitions on the magnetocaloric properties of HoZn and ErZn

Sousa

Ranke

Gandra

2011

Journal of Applied Physics

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We report a theoretical investigation on the magnetocaloric properties of the cubic CsCl-type HoZn and ErZn compounds. Several anomalies in the magnetocaloric quantities, DS T and DT S , are observed due to spontaneous and/or field-induced spin reorientation transitions in these compounds. In HoZn, a discontinuity in the isothermal entropy change and in the adiabatic temperature change around T 1 ¼ 23 K is ascribed to the spontaneous reorientation transition. Under a magnetic field variation from 0 up to 2 T in the h110i and h100i directions, an almost table-like behavior in DS T is predicted between T 1 and T SR1 . The peak around the ferromagnetic-paramagnetic transition temperature in the magnetocaloric quantities shows a dependence on the direction of the applied field. For l 0 DH ¼ 2 T, it reaches 11.9 J/kg K (magnetic field along the h111i direction) and 7.9 J/kg K (magnetic field in the h100i direction). In ErZn there is also a dependence of DS T and DT S on field direction. From the analysis of the spin reorientations in both compounds we have built spin reorientation diagrams that summarize their temperature and field dependence. Our theoretical approach is based on a model Hamiltonian that includes exchange, crystal field, and quadrupolar interactions. V

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