Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/102304
Title: Strong interplay between stripe spin fluctuations, nematicity and superconductivity in FeSe
Authors: Wang, Q.
Shen, Y.
Pan, B.
Hao, Y.
Ma, M.
Zhou, F.
Steffens, P.
Schmalzl, K.
Forrest, T. R.
Abdel-Hafiez, M.
Chen, X.
Chareev, D. A.
Vasiliev, A. N.
Bourges, P.
Sidis, Y.
Cao, H.
Zhao, J.
Issue Date: 2016
Publisher: Nature Publishing Group
Citation: Strong interplay between stripe spin fluctuations, nematicity and superconductivity in FeSe / Q. Wang, Y. Shen, B. Pan, et al. — DOI 10.1038/nmat4492 // Nature Materials. — 2016. — Vol. 15. — Iss. 2. — P. 159-163.
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 pairing. The experimental determination of these interactions, which are believed to depend on the orbital or the spin degrees of freedom, is challenging because nematic order occurs at, or slightly above, the ordering temperature of a stripe magnetic phase. Here, we study FeSe (ref.) - 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 spectroscopy. The magnetic spectral weight in FeSe is found to be comparable to that of the iron arsenides. Our results support recent theoretical proposals that both nematicity and superconductivity are driven by spin fluctuations. © 2016 Macmillan Publishers Limited. All rights reserved.
Keywords: ANTIFERROMAGNETISM
DEGREES OF FREEDOM (MECHANICS)
HIGH TEMPERATURE SUPERCONDUCTORS
IRON
NEUTRON SCATTERING
SPIN FLUCTUATIONS
ANTIFERROMAGNETIC ORDERINGS
EXPERIMENTAL DETERMINATION
IRON-BASED SUPERCONDUCTORS
ORDERING TEMPERATURE
ROTATIONAL SYMMETRIES
SCANNING TUNNELLING SPECTROSCOPY
SPIN DEGREES OF FREEDOM
SUPERCONDUCTING STATE
ELECTRON SPIN RESONANCE SPECTROSCOPY
URI: http://hdl.handle.net/10995/102304
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 84955452857
PURE ID: 656570
ad363dac-bf9d-490f-9d22-e0da5ccfb676
ISSN: 14761122
DOI: 10.1038/nmat4492
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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