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

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

doi:10.1038/nmat4492

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

Journal Article · Mon Dec 07 00:00:00 EST 2015 · Nature Materials

DOI:https://doi.org/10.1038/nmat4492· OSTI ID:1361297

Wang, Qisi ^[1]; Shen, Yao ^[1]; Pan, Bingying ^[1]; Hao, Yiqing ^[1]; Ma, Mingwei ^[2]; Zhou, Fang ^[2]; Steffens, P. ^[3]; Schmalzl, K. ^[4]; Forrest, T. R. ^[5]; Abdel-Hafiez, M. ^[6];

^[7]; Chareev, D. A. ^[8]; Vasiliev, A. N. ^[9]; Bourges, P. ^[10]; Sidis, Y. ^[10]; Cao, Huibo ^[11];

^[12]

Fudan Univ., Shanghai (China). Dept. of Physics. State Key Lab. of Surface Physics
Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics. Beijing National Lab. for Condensed Matter Physics
Inst. Laue-Langevin, Grenoble (France)
Julich Research Centre, Grenoble (France). Julich Centre for Neutron Science (JCNS)
European Synchrotron Radiation Facility, Grenoble (France)
Center for High Pressure Science and Technology Advanced Research, Shanghai (China); Fayoum Univ. (Egypt). Physics Dept.
Center for High Pressure Science and Technology Advanced Research, Shanghai (China)
Russian Academy of Sciences (RAS), Chernogolovka (Russian Federation). Inst. of Experimental Mineralogy
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)
Alternative Energies and Atomic Energy Commission (CEA-Saclay), Gif-sur-Yvette (France). Lab. Leon Brillouin
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Science Division
Fudan Univ., Shanghai (China). Dept. of Physics. State Key Lab. of Surface Physics. Collaborative Innovation Center of Advanced Microstructures

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.

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Research Organization:: 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 Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC); 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 Organization:: 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)

Grant/Contract Number:: AC05-00OR22725; 11374059; 2015CB921302; 13PJ1401100; 11190020; 2-2014-036; 13-02-00174; 14-02-92002; 14-02-92693

OSTI ID:: 1361297

Journal Information:: Nature Materials, Vol. 15, Issue 2; ISSN 1476-1122

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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