کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10710248 | 1024661 | 2005 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Magnetic properties of La1âxCaxCoO3 single crystals
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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: Magnetic properties of La1âxCaxCoO3 single crystals Magnetic properties of La1âxCaxCoO3 single crystals](/preview/png/10710248.png)
چکیده انگلیسی
DC magnetization and optical measurements have been carried out for La1âxCaxCoO3 single crystals (x=0.1, 0.15, 0.2). The results indicate an inhomogeneous distribution of Ca2+ ions in a microscopic local scale, and existence of phase separation into a hole-rich ferromagnetic regions and a hole-poor host matrix. It was shown that with a temperature decrease the system evolves from a paramagnetic state of weakly interacting cobalt ions, through weakly interacting spin clusters, to the cluster glass state. The measured magnetic field dependences of magnetization have indicated that the volume of a hole-rich ferromagnetic cluster grows in magnetic field. These clusters can be considered as a precursor of the doping-induced ferromagnetic state. The analysis of the Curie-Weiss behavior at high temperature has shown that Ca doping stabilizes Co3+ ions in the intermediate spin state. Nevertheless, the small part of cobalt ions in the low spin state, up to about 10%, was suggested to exist for all levels of doping in paramagnetic phase up to room temperature. The long-time relaxation phenomena were found to follow a power law.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 285, Issue 3, January 2005, Pages 386-394
Journal: Journal of Magnetism and Magnetic Materials - Volume 285, Issue 3, January 2005, Pages 386-394
نویسندگان
H. Szymczak, M. Baran, G.-J. Babonas, R. Diduszko, J. Fink-Finowicki, R. Szymczak,