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Search for orbital excitation in YTiO$$_3$$ by neutron scattering

YTiO$$_3$$における中性子散乱による軌道励起の探索

社本 真一  ; 坪田 雅己*; 伊賀 文俊*; F${aa}$k, B.*; 梶谷 剛*

Shamoto, Shinichi; Tsubota, Masami*; Iga, Fumitoshi*; F${aa}$k, B.*; Kajitani, Tsuyoshi*

30Kの強磁性転移温度を持つYTiO$$_3$$を、5, 40, 200Kの温度で、また130, 500meVの入射エネルギーで、MARI分光器によって調べた。広いQ-E領域(0.5$$<$$Q$$<$$25$AA $^{-1}$$, 6$$<$$E$$<$$350meV)で、明瞭な軌道励起は観測できなかった。軌道励起の強度はフォノンに比べて顕著に低いと思われる。

YTiO$$_3$$ with T$$_c$$~30 K has been studied by the MARI spectrometer with E$$_i$$=130 meV and 500 meV at T=5 K, 40K, and 200 K. We have not found any clear orbital excitation in a wide Q-E range (0.5$$<$$Q$$<$$25$AA $^{-1}$$, 6$$<$$E$$<$$350 meV). The intensity of orbital excitation would be significantly weak in comparison with the phonon.

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