Doping dependence of the spin excitations in the Fe-based superconductors Fe1+yTe1-xSex

作者：Christianson A D^*; Lumsden M D; Marty K; Wang C H; Calder S; Abernathy D L; Stone M B; Mook H A; McGuire M A; Sefat A S; Sales B C; Mandrus D; Goremychkin E A

来源：Physical Review B, 2013, 87(22): 224410.

DOI：10.1103/PhysRevB.87.224410

The Fe1+yTe1-xSex series of materials is one of the prototype families of Fe-based superconductors. To provide further insight into these materials, we present systematic inelastic neutron scattering measurements of the low-energy spin excitations for x = 0.27, 0.36, 0.40, and 0.49. These measurements show an evolution of incommensurate spin excitations towards the (1/2,1/2,0) wave vector with doping. Concentrations (x = 0.40 and 0.49) which exhibit the most robust superconducting properties have spin excitations closest to (1/2,1/2,0) and also exhibit a strong spin resonance in the spin excitation spectrum below T-c. The resonance signal appears to be closer to (1/2,1/2,0) than the underlying spin excitations. We discuss the possible relationship between superconductivity and spin excitations at the (1/2,1/2,0) wave vector and the role that interstitial Fe may play.

• 出版日期2013-6-12