کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1820047 | 1525773 | 2007 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Small Fermi energy, strong electron-phonon effects and anharmonicity in MgB2
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موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
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چکیده انگلیسی
The investigation of the electron-phonon properties in MgB2 has attracted a huge interest after the discovery of superconductivity with Tc = 39 K in this compound. Although superconductivity is often described in terms of the conventional Eliashberg theory, properly generalized in the multiband/multigap scenario, important features distinguish MgB2 from other conventional strong-coupling superconductors. Most important it is the fact that a large part of the total electron-phonon strength seems to be concentrated here in only one phonon mode, the boron-boron E2g stretching mode. Another interesting property is the small Fermi energy of the Ï bands, which are strongly coupled with the E2g mode. In this contribution, we discuss how the coexistence of both these features give rise to an unconventional phenomenology of the electron-phonon properties.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica C: Superconductivity and its Applications - Volumes 460â462, Part 1, 1 September 2007, Pages 70-73
Journal: Physica C: Superconductivity and its Applications - Volumes 460â462, Part 1, 1 September 2007, Pages 70-73
نویسندگان
E. Cappelluti, L. Pietronero,