کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1819133 1525762 2009 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Renormalization group analysis of competing orders and the pairing symmetry in Fe-based superconductors
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
Renormalization group analysis of competing orders and the pairing symmetry in Fe-based superconductors
چکیده انگلیسی

We analyze antiferromagnetism and superconductivity in novel Fe-based superconductors within the weak-coupling, itinerant model of electron and hole pockets near (0, 0) and (π, π) in the folded Brillouin zone. We discuss the interaction Hamiltonian, the nesting, the RG flow of the couplings at energies above and below the Fermi energy, and the interplay between SDW magnetism, superconductivity and charge orbital order. We argue that SDW antiferromagnetism wins at zero doping but looses to superconductivity upon doping. We show that the most likely symmetry of the superconducting gap is A1g in the folded zone. This gap has no nodes on the Fermi surface but changes sign between hole and electron pockets. We also argue that at weak coupling, this pairing predominantly comes not from spin fluctuation exchange but from a direct pair hopping between hole and electron pockets.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica C: Superconductivity - Volume 469, Issues 9–12, 1 May–15 June 2009, Pages 640–650
نویسندگان
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