Polarized Neutron Scattering Study of β-Mn and β-Mn_<0.9> Al_<0.1>

概要

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Polarized neutron scattering measurements have been performed on β-Mn and β-Mn_<0.9>Al_<0.1> to study spin fluctuations. A large magnetic scattering peak at around Q=1.5 Å^<-1> was observed in the spectra obtained in the quasi-elastic condition, indicating the existence of strong spin fluctuations with antiferromagnetic correlation. The energy and Q spectra at 290 K exhibit nearly the same profiles and intensity for both samples. However, the energy spectra at low temperatures are quite different. For the pure β-Mn, the intensity decreases with decreasing temperature and the energy width remains as broad as at 290 K. For β-Mn_<0.9>Al_<0.1>, on the other hand, the intensity increases due to narrowing of the energy spectrum at low temperatures, implying a slowing down of spin fluctuations. These results are discussed in terms of a spin-liquid to spin-glass transition caused by Al substitution.
社団法人日本物理学会の論文
1994-05-15