Low energy inelastic neutron scattering on LaFePO $_{0.9}$

Ishikado, Motoyuki*; Kodama, Katsuaki ; Kajimoto, Ryoichi* ; Nakamura, Mitsutaka ; Inamura, Yasuhiro ; Wakimoto, Shuichi ; Iyo, Akira*; Eisaki, Hiroshi*; Arai, Masatoshi; Shamoto, Shinichi ; Hong, T.*; Mutka, H.*

We report results of inelastic neutron scattering measurement on powder sample of relatively low-Tc LaFePO $_{0.9}$ ( $T_{rm c}$ 5 K). Spin fluctuation arising from -M point FS nesting was not clearly observed on LaFePO $_{0.9}$ . This feature is similar with LaFeAsO1-xFx (x = 15.8%, $T_{rm c}$ 7 K). Considering the fact that the magnetic fluctuation is also observed on high- $T_{rm c}$ material of x=8.2% ( $T_{rm c}$ =29 K), it indicates strong correlation between magnetic fluctuation arising from -M FS nesting and high- $T_{rm c}$ . Furthermore, we also report recent experimental results performed by using CTAX (Triple Axis Spectrometer) at HFIR in ORNL and IN5 (chopper spectrometer) in ILL in order to see magnetic excitation and resonance mode at lower - space and temperature region on LaFePO $_{0.9}$ .

Language	:	English
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Meeting title	:	2012 Materials and Mechanisms of Superconductivity Conference (M $^{2}$ S 2012)
Held date	:	2012/07
Location (city)	:	Washington, D.C.
Location (country)	:	U.S.A.
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Keywords	:	no keyword
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Cooperating Institute	:	総合科学研究機構

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Registration No. : BB20122723
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