کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1808847 | 1525178 | 2015 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Critical magnetic behavior and large magnetocaloric effect in Pr0.67Ba0.33MnO3 perovskite manganite
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Critical magnetic behavior and large magnetocaloric effect in Pr0.67Ba0.33MnO3 perovskite manganite Critical magnetic behavior and large magnetocaloric effect in Pr0.67Ba0.33MnO3 perovskite manganite](/preview/png/1808847.png)
چکیده انگلیسی
We report results of critical magnetic behavior and magnetocaloric investigations of the perovskite manganite Pr0.67Ba0.33MnO3. The compound exhibits a paramagnetic (PM) to ferromagnetic (FM) transition at the Curie temperature TC, and significant negative magnetoresistance in a wide temperature range. To probe the magnetic interactions responsible for the magnetic transitions, we performed a critical exponent analysis in the vicinity of the FM-PM transition region. Magnetic entropy change ÎSM was estimated from isothermal magnetization data. We have found a remarkable large value of |ÎSM| around TC's, of about 5.50 J/kg K for μ0ÎH=4 T and a large relative cooling power (~225 J/kg). The analysis was done by using the modified Arrot plot (MAP) method. The values of the obtained critical exponents associated with this transition, β=0.366, γ=1.375 and δ=4.743 are close to those expected for the short range 3D Heisenberg model. The model was also confirmed by using |ÎSM|â(μ0H)n, the field dependence of magnetic entropy change method. The large measured magnetocaloric effect is presumed to arise as a consequence of the sample preparation route.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica B: Condensed Matter - Volumes 470â471, August 2015, Pages 96-101
Journal: Physica B: Condensed Matter - Volumes 470â471, August 2015, Pages 96-101
نویسندگان
A. Varvescu, I.G. Deac,