TY  - JOUR
AU  - Li, Yu
AU  - Yin, Zhiping
AU  - Liu, Zhonghao
AU  - Wang, Weiyi
AU  - Xu, Zhuang
AU  - Song, Yu
AU  - Tian, Long
AU  - Huang, Yaobo
AU  - Shen, Dawei
AU  - Abernathy, D. L.
AU  - Niedziela, J. L.
AU  - Ewings, R. A.
AU  - Perring, T. G.
AU  - Pajerowski, Daniel M.
AU  - Matsuda, Masaaki
AU  - Bourges, Philippe
AU  - Mechthild, Enderle
AU  - Su, Yixi
AU  - Dai, Pengcheng
TI  - Coexistence of Ferromagnetic and Stripe Antiferromagnetic Spin Fluctuations in SrCo$_2$As$_2$
JO  - Physical review letters
VL  - 122
IS  - 11
SN  - 1079-7114
CY  - College Park, Md.
PB  - APS
M1  - FZJ-2019-02129
SP  - 117204
PY  - 2019
AB  - We 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.
LB  - PUB:(DE-HGF)16
C6  - pmid:30951336
UR  - <Go to ISI:>//WOS:000461923000010
DO  - DOI:10.1103/PhysRevLett.122.117204
UR  - https://juser.fz-juelich.de/record/861696
ER  -