%0 Journal Article
%A Song, Yu
%A Van Dyke, John
%A Lum, I. K.
%A White, B. D.
%A Jang, Sooyoung
%A Yazici, Duygu
%A Shu, L.
%A Schneidewind, Astrid
%A Čermák, Petr
%A Qiu, Y.
%A Maple, M. B.
%A Morr, Dirk K.
%A Dai, Pengcheng
%T Robust upward dispersion of the neutron spin resonance in the heavy fermion superconductor Ce1−xYbxCoIn5
%J Nature Communications
%V 7
%@ 2041-1723
%C London
%I Nature Publishing Group
%M FZJ-2016-05178
%P 12774 -
%D 2016
%X The neutron spin resonance is a collective magnetic excitation that appears in theunconventional copper oxide, iron pnictide and heavy fermion superconductors. Althoughthe resonance is commonly associated with a spin-exciton due to the d(s±)-wave symmetryof the superconducting order parameter, it has also been proposed to be amagnon-like excitation appearing in the superconducting state. Here we use inelastic neutronscattering to demonstrate that the resonance in the heavy fermion superconductorCe1-xYbxCoIn5 with x=0, 0.05 and 0.3 has a ring-like upward dispersion that is robustagainst Yb-doping. By comparing our experimental data with a random phase approximationcalculation using the electronic structure and the momentum dependence of the d(x2 -y2)-wavesuperconducting gap determined from scanning tunnelling microscopy (STM) for CeCoIn5,we conclude that the robust upward-dispersing resonance mode in Ce1-xYbxCoIn5 isinconsistent with the downward dispersion predicted within the spin-exciton scenario.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000385256500004
%$ pmid:27677397
%R 10.1038/ncomms12774
%U https://juser.fz-juelich.de/record/819535