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$$^{149}$$Sm synchrotron-radiation-based M$"{o}$ssbauer spectroscopy of Sm-based heavy fermion compounds

シンクロトロン放射光を利用した$$^{149}$$Smメスバウアー分光による重い電子系Sm化合物の研究

筒井 智嗣; 東中 隆二*; 水牧 仁一朗*; 小林 義男*; 中村 仁*; 伊藤 孝   ; 依田 芳卓*; 松田 達磨*; 青木 勇二*; 佐藤 英行*

Tsutsui, Satoshi; Higashinaka, Ryuji*; Mizumaki, Masaichiro*; Kobayashi, Yoshio*; Nakamura, Jin*; Ito, Takashi; Yoda, Yoshitaka*; Matsuda, Tatsuma*; Aoki, Yuji*; Sato, Hideyuki*

$$^{149}$$Sm synchrotron-radiation-based M$"{o}$ssbauer spectroscopy has been applied to Sm-based heavy fermion intermetallics, Sm$$Tr_2$$Al$$_{20}$$ ($$Tr$$ = Ti, V and Cr) and SmOs$$_{4}$$Sb$$_{12}$$. The isomer shifts obtained demonstrate that the Sm valence states in these compounds are intermediate. Since the difference of the isomer shifts in 22.502 keV $$^{149}$$Sm M$"{o}$ssbauer effect between Sm$$^{2+}$$ and Sm$$^{3+}$$ state is comparable to the 2nd order Doppler shift, consideration of the 2nd order Doppler shift is required to precisely discuss Sm valence state through the shifts of the M$"{o}$ssbauer spectra. In addition, the plots of the isomer shifts obtained by the M$"{o}$ssbauer spectroscopy against the Sm valence states estimated from Sm L-edge X-ray absorption spectroscopy exhibit a linear correlation except for that in SmOs$$_4$$Sb$$_{12}$$. This implies that the origin of the intermediate valence state in SmOs$$_4$$Sb$$_{12}$$ differs from that in Sm$$Tr_2$$Al$$_{20}$$ ($$Tr$$ = Ti, V and Cr).

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