title: Study of ⁵⁷Fe Mössbauer effect in RFe₂Zn₂₀ (R = Lu, Yb, Gd).
abstract: We report measurements of (57)Fe Mössbauer 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 (57)Fe site hyperfine field for → was evaluated to be  ∼2.4 T.
authors.affiliation: Ames Laboratory US DOE and Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, USA.
authors.forename: Sergey L
authors.initials: SL
authors.lastname: Bud'ko
authors.forename: Tai
authors.initials: T
authors.lastname: Kong
authors.forename: Xiaoming
authors.initials: X
authors.lastname: Ma
authors.forename: Paul C
authors.initials: PC
authors.lastname: Canfield