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Open AccessArticle

Q Dependence of Magnetic Resonance Mode on FeTe0.5Se0.5 Studied by Inelastic Neutron Scattering

1
Neutron Science and Technology Center, Comprehensive Research Organization for Science and Society (CROSS), Tokai, Ibaraki 319-1106, Japan
2
Materials Sciences Research Center, Japan Atomic Energy Agency (JAEA), Tokai, Ibaraki 319-1195, Japan
3
J-PARC Center, Japan Atomic Energy Agency (JAEA), Tokai, Ibaraki 319-1195, Japan
4
Advanced Science Research Center, Japan Atomic Energy Agency (JAEA), Tokai, Ibaraki 319-1195, Japan
*
Authors to whom correspondence should be addressed.
Current address: Max Planck POSTECH Center, 37673 Pohang, Korea.
Current address: European Spallation Source ESS AB, Stora Algatan 4, SE-22100 Lund, Sweden.
Condens. Matter 2019, 4(3), 69; https://doi.org/10.3390/condmat4030069
Received: 28 December 2018 / Revised: 2 July 2019 / Accepted: 9 July 2019 / Published: 12 July 2019
(This article belongs to the Special Issue Selected Papers from Quantum Complex Matter 2018)
Inelastic neutron scattering measurements have been performed on a superconducting single crystal FeTe 0.5 Se 0.5 to examine the Q -dependent enhancement of the dynamical structure factor, S ( Q , E ) , from Q = (0, 0) to ( π , π ), including ( π , 0) in the superconducting state. In most of iron-based superconductors, S ( Q , E ) is enhanced at Q = ( π , 0), where the “magnetic resonance mode” is commonly observed in the unfolded Brillouin zone. Constant-E cuts of S ( Q , E ) suggest that the enhancement is not uniform in the magnetic excitation, and limited around Q = ( π , 0). This result is consistent with the theoretical simulation of the magnetic resonance mode due to the Bardeen–Cooper–Schrieffer coherence factor with the sign-reversing order parameter of s ± wave. View Full-Text
Keywords: magnetic resonance; Q dependence; s± wave magnetic resonance; Q dependence; s± wave
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Ishikado, M.; Kodama, K.; Kajimoto, R.; Nakamura, M.; Inamura, Y.; Ikeuchi, K.; Ji, S.; Arai, M.; Shamoto, S.-I. Q Dependence of Magnetic Resonance Mode on FeTe0.5Se0.5 Studied by Inelastic Neutron Scattering. Condens. Matter 2019, 4, 69.

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