Influence of negative lattice expansion and metamagnetic transition on magnetic entropy change in the compound LaFe[sub 11.4]Si[sub 1.6]

Hu, Feng-xia; Shen, Bao-gen; Sun, Ji-rong; Cheng, Zhao-hua; Rao, Guang-hui; Zhang, Xi-xiang
June 2001
Applied Physics Letters;6/4/2001, Vol. 78 Issue 23, p3675
Academic Journal
Magnetization of the compound LaFe[sub 11.4]Si[sub 1.6] with the cubic NaZn[sub 13]-type structure was measured as functions of temperature and magnetic field around its Curie temperature T[sub C] of ∼208 K. It is found that the magnetic phase transition at T[sub C] is completely reversible. Magnetic entropy change ΔS, allowing one to estimate the magnetocaloric effect, was determined based on the thermodynamic Maxwell relation. The achieved magnitude of |ΔS| reaches 19.4 J/kg K under a field of 5 T, which exceeds that of most other materials involving a reversible magnetic transition in the corresponding temperature range. The large entropy change is ascribed to the sharp change of magnetization, which is caused by a large negative lattice expansion at the T[sub C]. An asymmetrical broadening of |ΔS| peak with increasing field was observed, which is resulted from the field-induced itinerant-electron metamagnetic transition from the paramagnetic to ferromagnetic state above the T[sub C]. © 2001 American Institute of Physics.


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