TY  - JOUR
AU  - Song, Yu
AU  - Van Dyke, John
AU  - Lum, I. K.
AU  - White, B. D.
AU  - Jang, Sooyoung
AU  - Yazici, Duygu
AU  - Shu, L.
AU  - Schneidewind, Astrid
AU  - Čermák, Petr
AU  - Qiu, Y.
AU  - Maple, M. B.
AU  - Morr, Dirk K.
AU  - Dai, Pengcheng
TI  - Robust upward dispersion of the neutron spin resonance in the heavy fermion superconductor Ce1−xYbxCoIn5
JO  - Nature Communications
VL  - 7
SN  - 2041-1723
CY  - London
PB  - Nature Publishing Group
M1  - FZJ-2016-05178
SP  - 12774 -
PY  - 2016
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000385256500004
C6  - pmid:27677397
DO  - DOI:10.1038/ncomms12774
UR  - https://juser.fz-juelich.de/record/819535
ER  -