Details

Autor(en) / Beteiligte

• Wang, Qisi
• Shen, Yao
• Pan, Bingying
• Hao, Yiqing
• Ma, Mingwei
• Zhou, Fang
• Steffens, P.
• Schmalzl, K.
• Forrest, T. R.
• Abdel-Hafiez, M.
• Chen, Xiaojia
• Chareev, D. A.
• Vasiliev, A. N.
• Bourges, P.
• Sidis, Y.
• Cao, Huibo
• Zhao, Jun

Titel

Strong interplay between stripe spin fluctuations, nematicity and superconductivity in FeSe

Ist Teil von

• Nature materials, 2016-02, Vol.15 (2), p.159-163

Ort / Verlag

London: Nature Publishing Group UK

Erscheinungsjahr

2016

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Neutron scattering measurements provide evidence for strong coupling between stripe spin fluctuations, nematicity and superconductivity in single-crystalline FeSe. 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 1 . The experimental determination of these interactions, which are believed to depend on the orbital or the spin degrees of freedom 1 , 2 , 3 , 4 , is challenging because nematic order occurs at, or slightly above, the ordering temperature of a stripe magnetic phase 1 , 5 . Here, we study FeSe (ref.  6 )—which exhibits a nematic (orthorhombic) phase transition at T s = 90 K without antiferromagnetic ordering—by neutron scattering, finding substantial stripe spin fluctuations coupled with the nematicity that are enhanced abruptly on cooling through T s . 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 7 . The magnetic spectral weight in FeSe is found to be comparable to that of the iron arsenides 8 , 9 . Our results support recent theoretical proposals that both nematicity and superconductivity are driven by spin fluctuations 1 , 10 , 11 , 12 , 13 .