Journal Article

FZJ-2019-02129

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Coexistence of Ferromagnetic and Stripe Antiferromagnetic Spin Fluctuations in SrCo$_2$As$_2$

Li, Y. ; Yin, Z. (Corresponding author) ; Liu, Z. ; Wang, W. ; Xu, Z. ; Song, Y. ; Tian, L. ; Huang, Y. ; Shen, D. ; Abernathy, D. L. ; Niedziela, J. L. ; Ewings, R. A. ; Perring, T. G. ; Pajerowski, D. M. ; Matsuda, M. ; Bourges, P. ; Mechthild, E. ; Su, Y.FZJ* ; Dai, P.

2019
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/21933  doi:10.1103/PhysRevLett.122.117204

Abstract: 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.

Keyword(s): Magnetic Materials (1st) ; Magnetism (2nd)

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Contributing Institute(s):

1. JCNS-FRM-II (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. Measurement at external facility

Appears in the scientific report 2019

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF >= 5 ; JCR ; NCBI Molecular Biology Database ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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