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|Type:||Artigo de periódico|
|Title:||The Influence Of Spontaneous And Field-induced Spin Reorientation Transitions On The Magnetocaloric Properties Of Hozn And Erzn|
|Author:||De Sousa V.S.R.|
Von Ranke P.J.
|Abstract:||We report a theoretical investigation on the magnetocaloric properties of the cubic CsCl-type HoZn and ErZn compounds. Several anomalies in the magnetocaloric quantities, ΔS T and ΔT 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 23 K is ascribed to the spontaneous reorientation transition. Under a magnetic field variation from 0 up to 2 T in the 110 and 100 directions, an almost table-like behavior in S 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 μ 0ΔH = 2 T, it reaches 11.9 J/kgK (magnetic field along the 111 direction) and 7.9 J/kg K (magnetic field in the 100 direction). In ErZn there is also a dependence of ΔS T and ΔT 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. © 2011 American Institute of Physics.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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