A temperature-dependent Mössbauer study of CeSn<sub>3sub> and CeSn<sub>3.1sub> single crystals

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• 作者：R.K. Singhal ; S.K. Gaur ; S.N. Dolia ; K.B. Garg ; J. Larrea J. ; D.R. Sá ; nchez ; E.M. Baggio-Saitovitch
• 关键词：CeSn<sub>3sub> crystal ; Mö ; ssbauer spectroscopy ; Isomer shift ; Mixed valence
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2008
• 期刊代码：31_03048853
• 类别：ph
• 出版时间：January 2008
• 卷：320
• 期：1-2
• 页码：25-30
• 文件大小：397 K

摘要

The <sup>119sup>Sn Mössbauer spectra have been measured for the intermediate valent CeSn<sub>3sub> (stoichiometric) and CeSn<sub>3.1sub> (slightly non-stoichiometric) high-quality single crystals in the temperature range from 300 to 30 K with an aim to look into the local surrounding of the Sn site and its valence state in these crystals. The spectra clearly indicate a para-magnetic ground state throughout the temperature range. Two different doublets with a quadrupole interaction that we associate with two different paramagnetic S<sub>1sub> and S<sub>2sub> sites, result from our first attempt to fit the experimental spectra, the ratio between these sites S<sub>1sub>/S<sub>2sub> being around 3/1. The magnitudes of isomer shift reveal a 2+ valence state for the Sn, that does not show any change for either the S<sub>1sub> or the S<sub>2sub> sites, in the whole investigated temperature range. The different values of quadrupole splitting ΔE<sub>Qsub> for S<sub>1sub> and S<sub>2sub> again confirm that the Sn atoms have different atomic coordinations.