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

Journal Article · Fri Jan 01 00:00:00 EST 2010 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.82.172508· OSTI ID:1006453

Shamoto, S ^[1]; Ishikado, Motoyuki ^[2]; Christianson, Andrew D ^[3]; Lumsden, Mark D ^[3]; Wakimoto, S ^[1]; Kodama, K. ^[4]; Iyo, Akira ^[5]; Arai, Masatoshi ^[1]

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1. Japan Atomic Energy Agency (JAEA)
2. JAEA and JST-TRIP, Tokyo
3. ORNL
4. Japan Synchrotron Radiation Research Institute, SPring-8
5. JST-TRIP and NIAIST, Japan

An optimally doped iron-based superconductor LaFeAsO{sub 0.92}F{sub 0.08} with T{sub c} = 29 K has been studied by inelastic powder neutron scattering. The magnetic excitation at Q = 1.15 {angstrom}{sup -1} is enhanced below T{sub c}, leading to a peak at E{sub res}-13 meV as the resonance mode, in addition to the formation of a gap at low energy below the crossover energy {Delta}{sub c}-10 meV. The peak energy at Q = 1.15 {angstrom}{sup -1} corresponds to 5.2 k{sub B}T{sub 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 preominantly magnetic origin.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1006453
• Journal Information: Physical Review B, Vol. 82, Issue 17; ISSN 1098--0121
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ARSENIC OXIDES
EXCITATION
FLUORINE ADDITIONS
INELASTIC SCATTERING
IRON OXIDES
LANTHANUM OXIDES
NEUTRON DIFFRACTION
RESONANCE
SUPERCONDUCTORS
DOPED MATERIALS