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Ferromagnetic short-range order and magnetocaloric effect in Fe-doped LaMnO3 / Phung, ThanhPQ

Tác giả : Phung, ThanhPQ

Nhà xuất bản : Elsevier

Năm xuất bản : 2013

Chủ đề : 1. Perovskite manganites. 2. Article.

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We have studied the critical behavior and magnetocaloric effect of a perovskite-type manganite LaMn0.9Fe0.1O3with a second-order phase transition. Detailed critical analyses based on the modified Arrott plot method and the universal scaling law gave the critical parameters TC≈135.7 K, β¼0.35870.007, γ¼1.32870.003, and δ¼4.7170.06. Comparing to standard models, the critical exponent values determined in our work are close to those expected for the 3D Heisenberg model (withβ¼0.365,γ¼1.336, andδ¼4.80). This reflects an existence of ferromagnetic short-range order in LaMn0.9Fe0.1O3. Around TC, the magnetic entropy change reaches the maximum value (ΔSmax), which is about 3.8 J kg−1 K−1 for the appliedfield of 50 kOe. Particularly, its magnetic-field dependence obeys the power law|ΔSmax|∝Hn, where n¼0.63 is close to the value calculated from the relationn¼1+(β−1)/(β+γ)
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https://repository.vnu.edu.vn/handle/VNU_123/10103