کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8157049 1524853 2014 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Magnetic entropy change and critical exponents in double perovskite Y2NiMnO6
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
Magnetic entropy change and critical exponents in double perovskite Y2NiMnO6
چکیده انگلیسی
We report the magnetic entropy change (ΔSM) and the critical exponents in the double perovskite manganite Y2NiMnO6 with a ferromagnetic to paramagnetic transition TC~85K. For a magnetic field change ΔH=80kOe, a maximum magnetic entropy change ΔSM=−6.57J/kgK is recorded around TC. The critical exponents β=0.363±0.05 and γ=1.331±0.09 obtained from power law fitting to spontaneous magnetization MS(T) and the inverse initial susceptibility χ0−1(T) satisfy well to values derived for a 3D-Heisenberg ferromagnet. The critical exponent δ=4.761±0.129 is determined from the isothermal magnetization at TC. The scaling exponents corresponding to second order phase transition are consistent with the exponents from Kouvel-Fisher analysis and satisfy Widom׳s scaling relation δ=1+(γ/β). Additionally, they also satisfy the single scaling equation M(H,ϵ)=ϵβf±(H/ϵβ+γ) according to which the magnetization-field-temperature data around TC should collapse into two curves for temperatures below and above TC.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 368, November 2014, Pages 318-323
نویسندگان
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