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000861696 1001_ $$0P:(DE-HGF)0$$aLi, Yu$$b0
000861696 245__ $$aCoexistence of Ferromagnetic and Stripe Antiferromagnetic Spin Fluctuations in SrCo$_2$As$_2$
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000861696 520__ $$aWe use inelastic neutron scattering to study energy and wave vector dependence of spin fluctuations in SrCo2As2, derived from SrFe2−xCoxAs2 iron pnictide superconductors. Our data reveal the coexistence of antiferromagnetic (AF) and ferromagnetic (FM) spin fluctuations at wave vectors QAF=(1,0) and QFM=(0,0)/(2,0), respectively. By comparing neutron scattering results with those of dynamic mean field theory calculation and angle-resolved photoemission spectroscopy experiments, we conclude that both AF and FM spin fluctuations in SrCo2As2 are closely associated with a flatband of the eg orbitals near the Fermi level, different from the t2g orbitals in superconducting SrFe2−xCoxAs2. Therefore, Co substitution in SrFe2−xCoxAs2 induces a t2g to eg orbital switching, and is responsible for FM spin fluctuations detrimental to the singlet pairing superconductivity.
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000861696 7001_ $$0P:(DE-HGF)0$$aYin, Zhiping$$b1$$eCorresponding author
000861696 7001_ $$0P:(DE-HGF)0$$aLiu, Zhonghao$$b2
000861696 7001_ $$0P:(DE-HGF)0$$aWang, Weiyi$$b3
000861696 7001_ $$0P:(DE-HGF)0$$aXu, Zhuang$$b4
000861696 7001_ $$0P:(DE-HGF)0$$aSong, Yu$$b5
000861696 7001_ $$0P:(DE-HGF)0$$aTian, Long$$b6
000861696 7001_ $$0P:(DE-HGF)0$$aHuang, Yaobo$$b7
000861696 7001_ $$0P:(DE-HGF)0$$aShen, Dawei$$b8
000861696 7001_ $$0P:(DE-HGF)0$$aAbernathy, D. L.$$b9
000861696 7001_ $$0P:(DE-HGF)0$$aNiedziela, J. L.$$b10
000861696 7001_ $$0P:(DE-HGF)0$$aEwings, R. A.$$b11
000861696 7001_ $$0P:(DE-HGF)0$$aPerring, T. G.$$b12
000861696 7001_ $$0P:(DE-HGF)0$$aPajerowski, Daniel M.$$b13
000861696 7001_ $$0P:(DE-HGF)0$$aMatsuda, Masaaki$$b14
000861696 7001_ $$0P:(DE-HGF)0$$aBourges, Philippe$$b15
000861696 7001_ $$0P:(DE-HGF)0$$aMechthild, Enderle$$b16
000861696 7001_ $$0P:(DE-Juel1)130991$$aSu, Yixi$$b17
000861696 7001_ $$0P:(DE-HGF)0$$aDai, Pengcheng$$b18
000861696 773__ $$0PERI:(DE-600)1472655-5$$a10.1103/PhysRevLett.122.117204$$gVol. 122, no. 11, p. 117204$$n11$$p117204$$tPhysical review letters$$v122$$x1079-7114$$y2019
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