کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1816908 | 1025695 | 2006 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Influence of nonstoichiometry on the lattice excitations in the ZnxCuyCrzSe4 p-type spinel ferromagnetic conductors
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موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Influence of nonstoichiometry on the lattice excitations in the ZnxCuyCrzSe4 p-type spinel ferromagnetic conductors Influence of nonstoichiometry on the lattice excitations in the ZnxCuyCrzSe4 p-type spinel ferromagnetic conductors](/preview/png/1816908.png)
چکیده انگلیسی
The thermoelectric power analysis was used to study an influence of nonstoichiometry on the lattice excitations in the ferromagnetically ordered ZnxCuyCrzSe4 p-type spinel conductors in the temperature range from 5 to 400Â K between y=0.81 and 0.97. The above investigations showed that the thermoelectric power can be well explained considering the diffusion, phonon drag, magnon drag and impurity components. With increasing stoichiometry of a single crystal (i.e., with x+y+zâ3): diffusion and impurity components decrease, phonon drag and magnon drag components increase and the phonon and magnon drag peaks shift into higher temperatures and their intensity increase. Additionally, the thermoelectric power considerations showed that the strong ferromagnetic coupling connected mainly with double-exchange and RKKY mechanisms in the spinels under study make easier the spin wave excitations on one side and the nonstoichiometry hinders the spin wave excitations on the other. These effects are interpreted within a framework of the Mott, Debye and the Bloch theories.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica B: Condensed Matter - Volume 373, Issue 2, 15 March 2006, Pages 245-252
Journal: Physica B: Condensed Matter - Volume 373, Issue 2, 15 March 2006, Pages 245-252
نویسندگان
T. GroÅ, A. Krajewski, H. Duda, P. Urbanowicz,