Mossbauer Study of Ni_<0.995>^<57>Fe_<0.005>S_2 : Magnetic Structure of NiS_2

概要

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Mossbauer experiment has been performed of ^<57>Fe doped in antiferromagnetic NiS_2. The supertransferred hyperfine field of 19 kOe has been observed at 4.2 K. From the analysis of the supertransferred hyperfine field, it is concluded that NiS_2 has a non-collinear spin structure. The Ni spins with ordering of the first kind for fcc lattice make a constant angle θ with the principal axis of the electric field gradient at the Ni sites. The angle θ is (12±4)° above 30 K and (21±6)° below 30 K. The component of Ni spin with the first kind ordering varies smoothly through 30 K. No anomaly has been observed in the isomer shift and the quadrupole splitting is -(0.27±0.01)mm/sec at 295 K. An effect of u parameter of crystal lattice can explain the negative sign and the weak temperature dependence of the quadrupole splitting of ^<57>Fe in NiS_2.
社団法人日本物理学会の論文
1975-07-15