Neutron scattering of iron-based superconductors

Journal Article · Sat Jan 01 00:00:00 EST 2011 · Journal of the Physical Society of Japan

DOI:https://doi.org/10.1016/j.physc.2011.05.015· OSTI ID:1028742

Shamoto, S ^[1]; Wakimoto, S ^[1]; Kodama, K. ^[2]; Ishikado, Motoyuki ^[3]; Christianson, Andrew D ^[4]; Lumsden, Mark D ^[4]; Kajimoto, Ryoichi ^[5]; Nakamura, Mitsutaka ^[5]; Inamura, Yasuhiro ^[5]; Arai, Masatoshi ^[1]; Kakurai, K. ^[1]; Esaka, Fumitaka ^[1]; Iyo, Akira ^[6]; Kito, Hijiri ^[6]; Eisaki, Hiroshi ^[6]

---

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

Low-energy spin excitations have been studied on polycrystalline LaFeAsO{sub 1-x}F{sub x} samples by inelastic neutron scattering. The Q-integrated dynamical spin susceptibility {chi}{double_prime}({omega}) of the superconducting samples is found to be comparable to that of the magnetically ordered parent sample. On the other hand, {chi}{double_prime}({omega}) almost vanishes at x = 0.158, where the superconducting transition temperature T{sub c} is suppressed to 7 K. In addition, {chi}{double_prime}({omega}) in optimally doped LaFeAsO{sub 0.918}F{sub 0.082} with T{sub c} = 29 K exhibits a spin resonance mode. The peak energy, E{sub res}, when scaled by k{sub B}T{sub c} is similar to the value of about 4.7 reported in other high-T{sub c} iron-based superconductors. This result suggests that there is intimate relationship between the dynamical spin susceptibility and high-T{sub c} superconductivity in iron-based superconductors, and is consistent with a nesting condition between Fermi surfaces at the {Gamma} and M points.

• 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: 1028742
• Journal Information: Journal of the Physical Society of Japan, Vol. 471, Issue 21-22; ISSN 0921-4534
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
FERMI LEVEL
NEUTRONS
RESONANCE
SCATTERING
SPIN
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TRANSITION TEMPERATURE