Journal
PHYSICAL REVIEW B
Volume 88, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.88.224505
Keywords
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Funding
- University of Iowa
- Office of Basic Energy Sciences U.S. Department of Energy [DE-FG02-ER46900]
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We study spin resonance in the superconducting state of recently discovered alkali-intercalated iron selenide materials A(x)Fe(2-y)Se(2) (A = K, Rb, Cs) in which the Fermi surface has only electron pockets. Recent angle-resolved photoemission spectroscopy (ARPES) studies [M. Xu et al., Phys. Rev. B 85, 220504(R) (2012)] were interpreted as strong evidence for s-wave gap in these materials, while the observation of the resonance peak in neutron scattering measurements [G. Friemel et al., Phys. Rev. B 85, 140511 (2012)] suggests that the gap must have different signs at Fermi surface points connected by the momentum at which the resonance has been observed. We consider recently proposed unconventional s(+-) superconducting state of A(x)Fe(2-y)Se(2) with superconducting gap changing sign between the hybridized electron pockets. We argue that such a state supports a spin resonance. We compute the dynamical structure factor and show that it is consistent with the results of inelastic neutron scattering.
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