کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10625735 989634 2014 21 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Spin entropy enhancement tuned by spin state transition in La0.7−xYxCa0.3CoO3
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Spin entropy enhancement tuned by spin state transition in La0.7−xYxCa0.3CoO3
چکیده انگلیسی
The effect of spin states on the spin entropy has been studied in La0.7−xYxCa0.3CoO3 (x=0.0, 0.05, 0.1 and 0.15). Magnetothermopower results reveal that Y-doping improves the spin entropy of La0.7Ca0.3CoO3. The magnetic results indicate that the Co3+ ions undergo a transition from an intermediate spin state (t52ge1g; S=1) to a low spin state (t62ge0g; S=0), which results in the enhancement of the spin entropy. A suitable theoretical model is suggested to explain well the enhancement of the spin entropy induced by spin state transition. This investigation gives strong evidence that the enhanced spin entropy contribution to the thermopower is tuned by the spin state transition.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 40, Issue 4, May 2014, Pages 5365-5369
نویسندگان
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