کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9834156 | 1524907 | 2005 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Electron magnetic resonance (EMR) study of electron-hole asymmetry in La1âxCaxMnO3 manganites (x=0.2,0.8)
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
X-band EMR measurements on powdered samples of single-crystalline La0.8Ca0.2MnO3 and polycrystalline La0.2Ca0.8MnO3 manganites were carried out at 120⩽T⩽500 K aiming to study the effect of the electron-hole doping asymmetry in La1âxCaxMnO3 system. In the paramagnetic (PM) state both compounds differ in the nature of short-range magnetic orderings observed-clusters of double-exchange coupled Mn3+-Mn4+ ions and magneto-impurity-like clusters in the La0.8Ca0.2MnO3 and La0.2Ca0.8MnO3 compounds, respectively. Ferromagnetic ground state of La0.8Ca0.2MnO3 is characterized by the coexistence of orbitally ordered Mn3+ subsystem and Mn4+ with band-like carriers one, which are responsible for the multiline EMR spectra. Charge-ordered antiferromagnetic ground state of La0.2Ca0.8MnO3 causes a sharp decrease in intensity and then vanishing of the EMR signal observed in the PM region.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volumes 290â291, Part 2, April 2005, Pages 910-913
Journal: Journal of Magnetism and Magnetic Materials - Volumes 290â291, Part 2, April 2005, Pages 910-913
نویسندگان
A.I. Shames, E. Rozenberg, M. Auslender, G. Gorodetsky, C. Martin, A. Maignan, Ya.M. Mukovskii,