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Dynamical spin susceptibility studied by inelastic neutron scattering on LaFeAsO$$_{1-x}$$F$$_{x}$$

中性子非弾性散乱によって調べられたLaFeAsO$$_{1-x}$$F$$_{x}$$系の動的スピン磁化率

社本 真一; 石角 元志; 脇本 秀一; 樹神 克明; 梶本 亮一  ; 新井 正敏

Shamoto, Shinichi; Ishikado, Motoyuki; Wakimoto, Shuichi; Kodama, Katsuaki; Kajimoto, Ryoichi; Arai, Masatoshi

Low-energy spin excitations on polycrystalline LaFeAsO$$_{1-x}$$F$$_{x}$$ samples have been studied by inelastic neutron scattering. The $$Q$$-integrated dynamical spin susceptibility $$chi$$"($$omega$$) at 11 meV decreases with increasing fluorine content $$x$$ across the phase transition from antiferromagnetic to superconducting phases. For superconducting samples, a peak in $$chi$$"($$omega$$) develops at $$omega$$ = $$E$$$$_{rm res}$$ below $$T$$$$_{rm c}$$, accompanied by its reduction below $$E$$$$_{rm res}$$. Fe 3$$d$$ orbital contribution on the dynamical spin susceptibility and the electron scattering between $$Gamma$$and $$M$$ Fermi surfaces are discussed.

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