Neutron scattering of iron-based superconductors

S. Shamoto; S. Wakimoto; K. Kodama; M. Ishikado; A. D. Christianson; M. D. Lumsden; R. Kajimoto; M. Nakamura; Y. Inamura; M. Arai; K. Kakurai; F. Esaka; A. Iyo; H. Kito; H. Eisaki

doi:10.1016/j.physc.2011.05.015

Neutron scattering of iron-based superconductors

S. Shamoto, S. Wakimoto, K. Kodama, M. Ishikado, A. D. Christianson, M. D. Lumsden, R. Kajimoto, M. Nakamura, Y. Inamura, M. Arai, K. Kakurai, F. Esaka, A. Iyo, H. Kito, H. Eisaki

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Abstract

Low-energy spin excitations have been studied on polycrystalline LaFeAsO_1-xF_x samples by inelastic neutron scattering. The Q-integrated dynamical spin susceptibility χ″(ω) of the superconducting samples is found to be comparable to that of the magnetically ordered parent sample. On the other hand, χ″(ω) almost vanishes at x = 0.158, where the superconducting transition temperature T_c is suppressed to 7 K. In addition, χ″(ω) in optimally doped LaFeAsO_0.918F_0.082 with T_c = 29 K exhibits a spin resonance mode. The peak energy, E_res, when scaled by k_BT_c is similar to the value of about 4.7 reported in other high-T_c iron-based superconductors. This result suggests that there is intimate relationship between the dynamical spin susceptibility and high-T_c superconductivity in iron-based superconductors, and is consistent with a nesting condition between Fermi surfaces at the Γ and M points.

Original language	English
Pages (from-to)	639-642
Number of pages	4
Journal	Physica C: Superconductivity and its Applications
Volume	471
Issue number	21-22
DOIs	https://doi.org/10.1016/j.physc.2011.05.015
State	Published - Nov 2011

Funding

This work was supported by Grant-in-Aids for Specially Promoted Research (17001001) from the Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT) and JST, Transformative Research-Project on Iron Pnictides (TRIP). Inelastic neutron scattering experiments were partially conducted under UK–Japan and US–Japan collaborations. Work at ORNL was supported by the Scientific User Facilities Division, Office of Basic Energy Sciences, US Department of Energy.

Funders	Funder number
Scientific User Facilities Division
U.S. Department of Energy
Basic Energy Sciences
Ministry of Education, Culture, Sports, Science and Technology
Japan Science and Technology Agency

Keywords

Inelastic neutron scattering
Iron-based superconductor
Low energy spin excitation

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10.1016/j.physc.2011.05.015

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Shamoto, S., Wakimoto, S., Kodama, K., Ishikado, M., Christianson, A. D., Lumsden, M. D., Kajimoto, R., Nakamura, M., Inamura, Y., Arai, M., Kakurai, K., Esaka, F., Iyo, A., Kito, H., & Eisaki, H. (2011). Neutron scattering of iron-based superconductors. Physica C: Superconductivity and its Applications, 471(21-22), 639-642. https://doi.org/10.1016/j.physc.2011.05.015

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abstract = "Low-energy spin excitations have been studied on polycrystalline LaFeAsO1-xFx samples by inelastic neutron scattering. The Q-integrated dynamical spin susceptibility χ″(ω) of the superconducting samples is found to be comparable to that of the magnetically ordered parent sample. On the other hand, χ″(ω) almost vanishes at x = 0.158, where the superconducting transition temperature Tc is suppressed to 7 K. In addition, χ″(ω) in optimally doped LaFeAsO0.918F0.082 with Tc = 29 K exhibits a spin resonance mode. The peak energy, Eres, when scaled by kBTc is similar to the value of about 4.7 reported in other high-Tc iron-based superconductors. This result suggests that there is intimate relationship between the dynamical spin susceptibility and high-Tc superconductivity in iron-based superconductors, and is consistent with a nesting condition between Fermi surfaces at the Γ and M points.",

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author = "S. Shamoto and S. Wakimoto and K. Kodama and M. Ishikado and Christianson, {A. D.} and Lumsden, {M. D.} and R. Kajimoto and M. Nakamura and Y. Inamura and M. Arai and K. Kakurai and F. Esaka and A. Iyo and H. Kito and H. Eisaki",

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AU - Ishikado, M.

AU - Christianson, A. D.

AU - Lumsden, M. D.

AU - Kajimoto, R.

AU - Nakamura, M.

AU - Inamura, Y.

AU - Arai, M.

AU - Kakurai, K.

AU - Esaka, F.

AU - Iyo, A.

AU - Kito, H.

AU - Eisaki, H.

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N2 - Low-energy spin excitations have been studied on polycrystalline LaFeAsO1-xFx samples by inelastic neutron scattering. The Q-integrated dynamical spin susceptibility χ″(ω) of the superconducting samples is found to be comparable to that of the magnetically ordered parent sample. On the other hand, χ″(ω) almost vanishes at x = 0.158, where the superconducting transition temperature Tc is suppressed to 7 K. In addition, χ″(ω) in optimally doped LaFeAsO0.918F0.082 with Tc = 29 K exhibits a spin resonance mode. The peak energy, Eres, when scaled by kBTc is similar to the value of about 4.7 reported in other high-Tc iron-based superconductors. This result suggests that there is intimate relationship between the dynamical spin susceptibility and high-Tc superconductivity in iron-based superconductors, and is consistent with a nesting condition between Fermi surfaces at the Γ and M points.

AB - Low-energy spin excitations have been studied on polycrystalline LaFeAsO1-xFx samples by inelastic neutron scattering. The Q-integrated dynamical spin susceptibility χ″(ω) of the superconducting samples is found to be comparable to that of the magnetically ordered parent sample. On the other hand, χ″(ω) almost vanishes at x = 0.158, where the superconducting transition temperature Tc is suppressed to 7 K. In addition, χ″(ω) in optimally doped LaFeAsO0.918F0.082 with Tc = 29 K exhibits a spin resonance mode. The peak energy, Eres, when scaled by kBTc is similar to the value of about 4.7 reported in other high-Tc iron-based superconductors. This result suggests that there is intimate relationship between the dynamical spin susceptibility and high-Tc superconductivity in iron-based superconductors, and is consistent with a nesting condition between Fermi surfaces at the Γ and M points.

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Neutron scattering of iron-based superconductors

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