A Mossbauer study of the cubic Laves phase intermetallic compound TmFe2

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Abstract
The results of a 169Tm and 57Fe Mossbauer study of the cubic Laves compound TmFe2 over the temperature range 1.3-550K are presented and discussed. The new results are used, in conjunction with existing NMR, Mossbauer and magnetic anisotropy data for TmFe2 and Tm metal, to deduce a value of P4f=536+or-14 MHz for the saturation value of the first excited state of the 169Tm nucleus. Estimates are also given for the exchange field mu BBex(T=0K)/kB=153+or-3K acting on the Tm3+ ion in TmFe2, the quadrupole moment of the I=3/2 state of the 169Tm nucleus, Q=-1.36+or-0.11 b, and the lattice contribution to the nuclear quadrupole interaction in Tm metal, Pc=-54.8+or-5 MHz (for Q=-1.20+or-0.07 b) and Pc=-61+or-8 MHz (for Q=-1.36+or-0.11 b). In addition, estimates are given for the various transferred and parent hyperfine fields in TmFe2.