Journal Article

FZJ-2015-07735

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Strong interplay between stripe spin fluctuations, nematicity and superconductivity in FeSe

Wang, Q. ; Shen, Y. ; Pan, B. ; Hao, Y. ; Ma, M. ; Zhou, F. ; Steffens, P. ; Schmalzl, K.FZJ* ; Forrest, T. R. ; Abdel-Hafiez, M. ; Chen, X. ; Chareev, D. A. ; Vasiliev, A. N. ; Bourges, P. ; Sidis, Y. ; Cao, H. ; Zhao, J. (Corresponding author)

2016
Nature Publishing Group Basingstoke

This record in other databases:      

Please use a persistent id in citations: doi:10.1038/nmat4492

Abstract: In iron-based superconductors the interactions driving the nematic order (that breaks four-fold rotational symmetry in the iron plane) may also mediate the Cooper pairing1. The experimental determination of these interactions, which are believed to depend on the orbital or the spin degrees of freedom1, 2, 3, 4, is challenging because nematic order occurs at, or slightly above, the ordering temperature of a stripe magnetic phase1, 5. Here, we study FeSe (ref. 6)—which exhibits a nematic (orthorhombic) phase transition at Ts = 90 K without antiferromagnetic ordering—by neutron scattering, finding substantial stripe spin fluctuations coupled with the nematicity that are enhanced abruptly on cooling through Ts. A sharp spin resonance develops in the superconducting state, whose energy (~4 meV) is consistent with an electron–boson coupling mode revealed by scanning tunnelling spectroscopy7. The magnetic spectral weight in FeSe is found to be comparable to that of the iron arsenides8, 9. Our results support recent theoretical proposals that both nematicity and superconductivity are driven by spin fluctuations

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Contributing Institute(s):

1. Streumethoden (JCNS-2)
2. Streumethoden (PGI-4)
3. JCNS-ILL (JCNS-ILL)

Research Program(s):

1. 144 - Controlling Collective States (POF3-144) (POF3-144)
2. 524 - Controlling Collective States (POF3-524) (POF3-524)
3. 6212 - Quantum Condensed Matter: Magnetism, Superconductivity (POF3-621) (POF3-621)
4. 6213 - Materials and Processes for Energy and Transport Technologies (POF3-621) (POF3-621)
5. 6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623) (POF3-623)

Appears in the scientific report 2016

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Database coverage:
; BIOSIS Previews ; Current Contents - Physical, Chemical and Earth Sciences ; IF >= 30 ; JCR ; NCBI Molecular Biology Database ; Nationallizenz ; No Authors Fulltext ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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