Тип публикации: статья из журнала
Год издания: 2016
Идентификатор DOI: 10.1103/PhysRevB.94.094517
Аннотация: We study the spin resonance in the superconducting state of iron-based materials within multiband models with two unequal gaps, Delta(L) and Delta(S), on different Fermi-surface pockets. We show that, due to the indirect nature of the gap entering the spin susceptibility at the nesting wave vector Q, the total gap (Delta) over tildПоказать полностьюe in the bare susceptibility is determined by the sum of gaps on two different Fermi-surface sheets connected by Q. For the Fermi-surface geometry characteristic of most iron pnictides and chalcogenides, the indirect gap is either (Delta) over tilde = Delta(L) + Delta(S) or (Delta) over tilde = 2 Delta(L). In the s(++) state, spin excitations below (Delta) over tilde are absent unless additional scattering mechanisms are assumed. The spin resonance appears in the s(+/-) superconducting state at frequency omega(R)
Журнал: PHYSICAL REVIEW B
Выпуск журнала: Vol. 94, Is. 9
ISSN журнала: 24699950
Место издания: COLLEGE PK
Издатель: AMER PHYSICAL SOC