Study of 57Fe Mossbauer effect in RFe2Zn20 ( R = Lu, Yb, Gd)
Sergey L. Bud'ko, Tai Kong, Xiaoming Ma, and Paul C Canfield
TL;DR
This study investigates the 57Fe Mossbauer spectra of RFe2Zn20 compounds with R = Lu, Yb, Gd, revealing temperature-dependent isomer shifts, quadrupole splitting correlations, and magnetic ordering in GdFe2Zn20.
Contribution
It provides detailed Mossbauer spectral analysis and hyperfine parameters for RFe2Zn20 compounds, including magnetic ordering insights for GdFe2Zn20.
Findings
Isomer shift values are similar across compounds.
Quadrupole splitting varies linearly with lattice constant.
GdFe2Zn20 exhibits ferromagnetic order at low temperature.
Abstract
We report measurements of 57Fe Mossbauer spectra for RFe2Zn20 ( R = Lu, Yb, Gd) from ~ 4.5 K to room temperature. The obtained isomer shift values are very similar for all three compounds, their temperature dependence was analyzed within the Debye model and resulted in an estimate of the Debye temperatures of 450-500 K. The values of quadrupole splitting at room temperature change with the cubic lattice constant a in a linear fashion. For GdFe2Zn20, ferromagnetic order is seen as an appearance of a sextet in the spectra. The 57Fe site hyperfine field for T = 0 was evaluated to be ~ 2.4 T.
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