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Title: Strong interplay between stripe spin fluctuations, nematicity and superconductivity in 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. 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. In this paper, we study FeSe—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. The magnetic spectral weight in FeSe is found to be comparable to that of the iron arsenides. Finally, our results support recent theoretical proposals that both nematicity and superconductivity are driven by spin fluctuations.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ; ORCiD logo [7] ;  [8] ;  [9] ;  [10] ;  [10] ;  [11] ; ORCiD logo [12]
  1. Fudan Univ., Shanghai (China). Dept. of Physics. State Key Lab. of Surface Physics
  2. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics. Beijing National Lab. for Condensed Matter Physics
  3. Inst. Laue-Langevin, Grenoble (France)
  4. Julich Research Centre, Grenoble (France). Julich Centre for Neutron Science (JCNS)
  5. European Synchrotron Radiation Facility, Grenoble (France)
  6. Center for High Pressure Science and Technology Advanced Research, Shanghai (China); Fayoum Univ. (Egypt). Physics Dept.
  7. Center for High Pressure Science and Technology Advanced Research, Shanghai (China)
  8. Russian Academy of Sciences (RAS), Chernogolovka (Russian Federation). Inst. of Experimental Mineralogy
  9. Lomonosov Moscow State Univ., Moscow (Russian Federation). Low Temperature Physics and Superconductivity Dept.; Ural Federal Univ., Ekaterinburg (Russian Federation). Theoretical Physics and Applied Mathematics Dept.; National Univ. of Science and Technology (MISiS), Moscow (Russian Federation)
  10. Alternative Energies and Atomic Energy Commission (CEA-Saclay), Gif-sur-Yvette (France). Lab. Leon Brillouin
  11. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Science Division
  12. Fudan Univ., Shanghai (China). Dept. of Physics. State Key Lab. of Surface Physics. Collaborative Innovation Center of Advanced Microstructures
Publication Date:
Grant/Contract Number:
AC05-00OR22725; 11374059; 2015CB921302; 13PJ1401100; 11190020; 2-2014-036; 13-02-00174; 14-02-92002; 14-02-92693
Type:
Accepted Manuscript
Journal Name:
Nature Materials
Additional Journal Information:
Journal Volume: 15; Journal Issue: 2; Journal ID: ISSN 1476-1122
Publisher:
Nature Publishing Group
Research Org:
Fudan Univ., Shanghai (China); National Univ. of Science and Technology (MISiS), Moscow (Russian Federation); Russian Academy of Sciences (RAS), Chernogolovka (Russian Federation); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Natural Science Foundation of China (NNSFC); Ministry of Science and Technology (China); Shanghai Pujiang Scholar Program (China); Ministry of Education and Science (Russian Federation); Russian Foundation for Basic Research (Russian Federation)
Contributing Orgs:
Chinese Academy of Sciences (CAS), Beijing (China); Inst. Laue-Langevin, Grenoble (France); Julich Research Centre, Grenoble (France); European Synchrotron Radiation Facility, Grenoble (France); Center for High Pressure Science and Technology Advanced Research, Shanghai (China); Fayoum Univ. (Egypt); Alternative Energies and Atomic Energy Commission (CEA-Saclay), Gif-sur-Yvette (France); Ural Federal Univ., Ekaterinburg (Russian Federation); Lomonosov Moscow State Univ., Moscow (Russian Federation)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Superconducting properties and materials; Magnetic properties and materials
OSTI Identifier:
1361297