Journal Article

FZJ-2016-05178

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Robust upward dispersion of the neutron spin resonance in the heavy fermion superconductor Ce1−xYbxCoIn5

Song, Y. ; Van Dyke, J. ; Lum, I. K. ; White, B. D. ; Jang, S. ; Yazici, D. ; Shu, L. ; Schneidewind, A. ; Čermák, P.FZJ* ; Qiu, Y. ; Maple, M. B. ; Morr, D. K. (Corresponding author) ; Dai, P. (Corresponding author)

2016
Nature Publishing Group London

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Please use a persistent id in citations: http://hdl.handle.net/2128/12492  doi:10.1038/ncomms12774

Abstract: 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.

Keyword(s): Basic research (1st) ; Magnetism (2nd)

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Contributing Institute(s):

1. JCNS-FRM-II (JCNS (München) ; Jülich Centre for Neutron Science JCNS (München) ; JCNS-FRM-II)
2. Streumethoden (JCNS-2)

Research Program(s):

1. 6G15 - FRM II / MLZ (POF3-6G15) (POF3-6G15)
2. 6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623) (POF3-623)

Experiment(s):

1. PANDA: Cold three axes spectrometer (SR2)

Appears in the scientific report 2016

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