Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Study of 57Fe Mossbauer effect in RFe2Zn20 ( R = Lu, Yb, Gd)   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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The categories of this paper are: physics
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The categories of this paper are: acc-phys
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The categories of this paper are: cmp-lg
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The categories of this paper are: ao-sci
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The categories of this paper are: chao-dyn
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-lat
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The categories of this paper are: funct-an
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The categories of this paper are: atom-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: q-alg
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The categories of this paper are: eess
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The categories of this paper are: math-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-ex
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The categories of this paper are: hep-ph