Quadrupolar splitting, Mossbauer spectra

YbNiSn was intensively investigated by °Yb Mossbauer spectroscopy in the paramagnetic and in the ferromagnetically ordered state (Bonville et al. 1992, Bellot et al. 1992). The 1.48 K spectrum shows hyperfine field splitting with five well-resolved lines with an experimental linewidth of about 3 mm/s (fig. 16). Due to the non-cubic ytterbium site, a quadrupolar hyperfine term with an electric field gradient is observed. In the paramagnetic phase (6K measurement) the spectrum shows two resolved lines which result from quadrupole splitting. 

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