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000819535 1001_ $$0P:(DE-HGF)0$$aSong, Yu$$b0
000819535 245__ $$aRobust upward dispersion of the neutron spin resonance in the heavy fermion superconductor Ce1−xYbxCoIn5
000819535 260__ $$aLondon$$bNature Publishing Group$$c2016
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000819535 520__ $$aThe 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.
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000819535 693__ $$0EXP:(DE-MLZ)PANDA-20140101$$1EXP:(DE-MLZ)FRMII-20140101$$5EXP:(DE-MLZ)PANDA-20140101$$6EXP:(DE-MLZ)SR2-20140101$$aForschungs-Neutronenquelle Heinz Maier-Leibnitz $$ePANDA: Cold three axes spectrometer$$fSR2$$x0
000819535 7001_ $$0P:(DE-HGF)0$$aVan Dyke, John$$b1
000819535 7001_ $$0P:(DE-HGF)0$$aLum, I. K.$$b2
000819535 7001_ $$0P:(DE-HGF)0$$aWhite, B. D.$$b3
000819535 7001_ $$0P:(DE-HGF)0$$aJang, Sooyoung$$b4
000819535 7001_ $$0P:(DE-HGF)0$$aYazici, Duygu$$b5
000819535 7001_ $$0P:(DE-HGF)0$$aShu, L.$$b6
000819535 7001_ $$0P:(DE-Juel1)156579$$aSchneidewind, Astrid$$b7$$ufzj
000819535 7001_ $$0P:(DE-Juel1)159141$$aČermák, Petr$$b8
000819535 7001_ $$0P:(DE-Juel1)162324$$aQiu, Y.$$b9
000819535 7001_ $$0P:(DE-HGF)0$$aMaple, M. B.$$b10
000819535 7001_ $$0P:(DE-HGF)0$$aMorr, Dirk K.$$b11$$eCorresponding author
000819535 7001_ $$00000-0002-6088-3170$$aDai, Pengcheng$$b12$$eCorresponding author
000819535 773__ $$0PERI:(DE-600)2553671-0$$a10.1038/ncomms12774$$gVol. 7, p. 12774 -$$p12774 -$$tNature Communications$$v7$$x2041-1723$$y2016
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