کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1820048 | 1525773 | 2007 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Impurity effects on superconductivity and anisotropy in MgB2
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موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
We have studied the effects of C- and Mn-substitution on physical properties of MgB2, using single crystals. Optical reflectivity measurements have successfully separated the changes in plasma frequency and scattering rate in Ï- and Ï-band. The former indicates that electrons are doped by C-substitution but the two dimensional Ï-band Fermi surfaces survive at least up to 10% doping. Increase in carrier scattering rate with C-substitution is much stronger in the Ï-bands than in the Ï-bands, which leads to the decrease in the in-plane coherence length as well as the anisotropy of Hc2. Raman scattering experiment showed that Mn impurity acts as a strong magnetic pair-breaker without changing the electron-phonon coupling.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica C: Superconductivity and its Applications - Volumes 460â462, Part 1, 1 September 2007, Pages 74-77
Journal: Physica C: Superconductivity and its Applications - Volumes 460â462, Part 1, 1 September 2007, Pages 74-77
نویسندگان
S. Tajima, T. Masui, N. Suemitsu, S. Lee, T. Kakeshita,