Mossbauer Study of Hyperfine Field, Quadrupole Interaction, and Isomer Shift of Fe^<57> in FeS_<1.00>, FeS_<1.05> and FeS_<1.07>

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The hyperfine structures of Fe^<57> in FeS_<1.00>, FeS_<1.05> and FeS_<1.07> have been investigated by the method of the Mossbauer absorption. The extrapolated values of the magnetic fields at the iron nuclei in FeS_<1.00>, FeS_<1.05> and FeS_<1.07> are 328 kOe, 318 kOe and 324 kOe at 0°K respectively. The energy shifts due to the quadrupole interaction in FeS_<1.05> at 290°K and 90°K have opposite sign and their ratio is -2.8. The corresponding ratio in FeS_<1.07> is -2.0. This indicates that the antiferrornagnetic easy axis changes by 90° through the transition temperature from the c axis, which is considered as the direction of the largest electric field gradient, onto the c plane, while direction and value of the electric field gradient remain unchanged. Observed internal magnetic fields, quadrupole coupling constants, and isomer shifts at various temperatures are given in Table 1.
社団法人日本物理学会の論文
1962-10-05