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 -