TY - JOUR
T1 - Neutron scattering of iron-based superconductors
AU - Shamoto, S.
AU - Wakimoto, S.
AU - Kodama, K.
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.
N1 - Funding Information:
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.
PY - 2011/11
Y1 - 2011/11
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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U2 - 10.1016/j.physc.2011.05.015
DO - 10.1016/j.physc.2011.05.015
M3 - Article
AN - SCOPUS:80055005670
SN - 0921-4534
VL - 471
SP - 639
EP - 642
JO - Physica C: Superconductivity and its applications
JF - Physica C: Superconductivity and its applications
IS - 21-22
ER -