TY - JOUR
T1 - Doping dependence of the spin excitations in the Fe-based superconductors Fe1+yTe1-xSex
AU - Christianson, A. D.
AU - Lumsden, M. D.
AU - Marty, K.
AU - Wang, C. H.
AU - Calder, S.
AU - Abernathy, D. L.
AU - Stone, M. B.
AU - Mook, H. A.
AU - McGuire, M. A.
AU - Sefat, A. S.
AU - Sales, B. C.
AU - Mandrus, D.
AU - Goremychkin, E. A.
PY - 2013/6/12
Y1 - 2013/6/12
N2 - 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 Tc. 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.
AB - 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 Tc. 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.
UR - http://www.scopus.com/inward/record.url?scp=84878999629&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.87.224410
DO - 10.1103/PhysRevB.87.224410
M3 - Article
AN - SCOPUS:84878999629
SN - 1098-0121
VL - 87
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 22
M1 - 224410
ER -