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149Sm synchrotron-radiation-based Mössbauer spectroscopy of Sm-based heavy fermion compounds

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Abstract

149Sm synchrotron-radiation-based Mössbauer spectroscopy has been applied to Sm-based heavy fermion intermetallics, SmTr2Al20 (Tr = Ti, V and Cr) and SmOs4Sb12. 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 149Sm Mössbauer effect between Sm2+ and Sm3+ 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 Mössbauer spectra. In addition, the plots of the isomer shifts obtained by the Mössbauer spectroscopy against the Sm valence states estimated from Sm L-edge X-ray absorption spectroscopy exhibit a linear correlation except for that in SmOs4Sb12. This implies that the origin of the intermediate valence state in SmOs4Sb12 differs from that in SmTr2Al20 (Tr = Ti, V and Cr).

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The data of 149Sm SR-based Mössbauer spectroscopy and Sm LIII-edge X-ray absorption spectroscopy were not open freely but stored at each beamline of SPring-8.

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Acknowledgements

The authors appreciate Tomoya Uruga, Hajime Tanida, Kiyofumi Nitta, Kazuo Kato and Naomi Kawamura for technical assistance in X-ray absorption spectroscopy. This work is financially supported by the Grants-in-Aids for the Scientific Research on the Innovative Area (Nos. JP15H05884 (J-Physics), JP21H00157 (High-Entropy Alloy) and for the transformative Research Area (No. JP23H04870 (Asymmetry Quantum Matter)) from the Ministry of Education, Culture, Sports, Science and Technology of Japan, the Grants-in-Aids for the Scientific Research (B) (Nos. JP15H03697, JP19H01839, JP19H04408), for the Scientific Research (C) (Nos. JP15K05178, JP22K03517) and for the Challenging Exploratory Research (No. JP15K14170) from the Japan Society of Promotion of Science and Tokyo Metropolitan Government Advanced Research (Grant No. H31-1). Synchrotron radiation experiments of 149Sm SR-based Mössbauer spectroscopy and Sm LIII-edge XAS were performed under the approval of JASRI (Proposal Nos. 2008A1972, 2011A1436, 2012A1333, 2012B1538, 2014B1139, 2015B1947, 2016A1413, 2016B1948, 2017A1060, 2017B1275, 2018A1534, 2019A1226, 2020A1346, 2020A2025, 2021A2052).

Funding

Satoshi Tsutsui:

the Grants-in-Aids for the Scientific Research on the Innovative Area (No.JP21H00157).

the Grants-in-Aids for the Scientific Research (B) (No. JP15H03697).

the Grants-in-Aids for the Scientific Research (B) (No. JP19H04408),

the Grants-in-Aids for the Challenging Exploratory Research (No. JP15K14170).

Ryuji Higashinaka.

the Grants-in-Aids for the Scientific Research (C) (No. JP15K05178).

Tokyo Metropolitan Government Advanced Research (Grant No. H31-1).

Masaichiro Mizumaki:

the Grants-in-Aids for the Scientific Research (B) (No. JP15H03697).

Tatsuma D. Matsuda:

the Grants-in-Aids for the Scientific Research on the Innovative Area (No. JP15H05884).

the Grants-in-Aids for the transformative Research Area (No. JP23H04870).

the Grants-in-Aids for the Scientific Research (C) (No. JP22K03517).

Tokyo Metropolitan Government Advanced Research (Grant No. H31-1).

Yuji Aoki:

the Grants-in-Aids for the Scientific Research (B) (No. JP19H01839).

Tokyo Metropolitan Government Advanced Research (Grant No. H31-1).

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ST designed the current work, performed the Mossbauer spectroscopy (MS) and X-ray absorption spectroscopy (XAS), analyzed the Mossbauer data, and written the initial version of the manuscript. RH has prepared the samples and analyzed the XAS data in a series of SmTr2Al20. MM has analyzed all the XAS data. YK and TUI performed the Mossbauer experiments. YY set upthe Mossbauer experiment. TDM, YA and HS have prepared the samples. All authors reviewed the manuscript.

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Correspondence to Satoshi Tsutsui.

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Tsutsui, S., Higashinaka, R., Mizumaki, M. et al. 149Sm synchrotron-radiation-based Mössbauer spectroscopy of Sm-based heavy fermion compounds. Hyperfine Interact 245, 9 (2024). https://doi.org/10.1007/s10751-024-01851-y

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