Inelastic neutron scattering study of the resonance mode in the optimally doped pnictide superconductor LaFeAsO0.92F0.08

Shin Ichi Shamoto; Motoyuki Ishikado; Andrew D. Christianson; Mark D. Lumsden; Shuichi Wakimoto; Katsuaki Kodama; Akira Iyo; Masatoshi Arai

doi:10.1103/PhysRevB.82.172508

Inelastic neutron scattering study of the resonance mode in the optimally doped pnictide superconductor LaFeAsO_0.92F_0.08

Shin Ichi Shamoto, Motoyuki Ishikado, Andrew D. Christianson, Mark D. Lumsden, Shuichi Wakimoto, Katsuaki Kodama, Akira Iyo, Masatoshi Arai

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Abstract

An optimally doped iron-based superconductor LaFeAsO_0.92 F _0.08 with T_c =29 K has been studied by inelastic powder neutron scattering. The magnetic excitation at Q=1.15 Å^-1 is enhanced below T_c, leading to a peak at E_res ∼13 meV as the resonance mode, in addition to the formation of a gap at low energy below the crossover energy Δ_c ∼10 meV. The peak energy at Q=1.15 Å^-1 corresponds to 5.2 k_B T_c in good agreement with the other values of resonance mode observed in iron-based superconductors. Although the phonon density of states has a peak at the same energy as the resonance mode in the present superconductor, the Q dependence is consistent with the resonance being of predominately magnetic origin.

Original language	English
Article number	172508
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	82
Issue number	17
DOIs	https://doi.org/10.1103/PhysRevB.82.172508
State	Published - Nov 18 2010

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title = "Inelastic neutron scattering study of the resonance mode in the optimally doped pnictide superconductor LaFeAsO0.92F0.08",

abstract = "An optimally doped iron-based superconductor LaFeAsO0.92 F 0.08 with Tc =29 K has been studied by inelastic powder neutron scattering. The magnetic excitation at Q=1.15 {\AA}-1 is enhanced below Tc, leading to a peak at Eres ∼13 meV as the resonance mode, in addition to the formation of a gap at low energy below the crossover energy Δc ∼10 meV. The peak energy at Q=1.15 {\AA}-1 corresponds to 5.2 kB Tc in good agreement with the other values of resonance mode observed in iron-based superconductors. Although the phonon density of states has a peak at the same energy as the resonance mode in the present superconductor, the Q dependence is consistent with the resonance being of predominately magnetic origin.",

author = "Shamoto, \{Shin Ichi\} and Motoyuki Ishikado and Christianson, \{Andrew D.\} and Lumsden, \{Mark D.\} and Shuichi Wakimoto and Katsuaki Kodama and Akira Iyo and Masatoshi Arai",

year = "2010",

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doi = "10.1103/PhysRevB.82.172508",

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T1 - Inelastic neutron scattering study of the resonance mode in the optimally doped pnictide superconductor LaFeAsO0.92F0.08

AU - Shamoto, Shin Ichi

AU - Ishikado, Motoyuki

AU - Christianson, Andrew D.

AU - Lumsden, Mark D.

AU - Wakimoto, Shuichi

AU - Kodama, Katsuaki

AU - Iyo, Akira

AU - Arai, Masatoshi

PY - 2010/11/18

Y1 - 2010/11/18

N2 - An optimally doped iron-based superconductor LaFeAsO0.92 F 0.08 with Tc =29 K has been studied by inelastic powder neutron scattering. The magnetic excitation at Q=1.15 Å-1 is enhanced below Tc, leading to a peak at Eres ∼13 meV as the resonance mode, in addition to the formation of a gap at low energy below the crossover energy Δc ∼10 meV. The peak energy at Q=1.15 Å-1 corresponds to 5.2 kB Tc in good agreement with the other values of resonance mode observed in iron-based superconductors. Although the phonon density of states has a peak at the same energy as the resonance mode in the present superconductor, the Q dependence is consistent with the resonance being of predominately magnetic origin.

AB - An optimally doped iron-based superconductor LaFeAsO0.92 F 0.08 with Tc =29 K has been studied by inelastic powder neutron scattering. The magnetic excitation at Q=1.15 Å-1 is enhanced below Tc, leading to a peak at Eres ∼13 meV as the resonance mode, in addition to the formation of a gap at low energy below the crossover energy Δc ∼10 meV. The peak energy at Q=1.15 Å-1 corresponds to 5.2 kB Tc in good agreement with the other values of resonance mode observed in iron-based superconductors. Although the phonon density of states has a peak at the same energy as the resonance mode in the present superconductor, the Q dependence is consistent with the resonance being of predominately magnetic origin.

UR - https://www.scopus.com/pages/publications/78649654154

U2 - 10.1103/PhysRevB.82.172508

DO - 10.1103/PhysRevB.82.172508

M3 - Article

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SN - 1098-0121

VL - 82

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 17

M1 - 172508

ER -

Inelastic neutron scattering study of the resonance mode in the optimally doped pnictide superconductor LaFeAsO_0.92F_0.08

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