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报道了稀土合金DY_(100-x)Y_x和Dy_(100 z) Nd_z的磁性及光电子能谱研究.磁性测量的结果表明,Dy—Nd合金中的dhcp结构晶场对轨道矩的抑制作用即使在6T的强外场下仍有残余表现.随Y(或Nd)含量的增加,合金中与Helix态相应的温度范围展宽(或变窄).光电子能谱的记录提示,轻稀土Nd的价起伏性质,使之在掺入Dy时产生增大Fermi波矢K_F的趋势.因而Nd掺入Dy引起Néel温度急剧减小的原因不仅仅在于它的稀释作用.轻稀土掺入重稀土将有助于抑制合金中的螺旋反铁磁相,从而克服“负磁热效应”。
The magnetic and photoelectron spectroscopy studies of DY_ (100-x) Y_x and Dy_ (100 z) Nd_z of rare earth alloys are reported.The results of magnetic measurements show that the inhibition of orbital moments by dhcp crystal structures in Dy-Nd alloys, 6T is still residual in strong field.With the increase of Y (or Nd) content, the temperature range corresponding to Helix state broadens (or narrows) in the alloy.The recording of photoelectron spectroscopy suggests that the valence property of light rare earth Nd , So that when Dy is added, it tends to increase the Fermi wave vector K_F, so the reason why Nd doping Dy causes a drastic decrease of Néel temperature is not only its dilution effect but also the incorporation of light rare earth into heavy rare earth will help to suppress Helical antiferromagnetic phase in the alloy to overcome the “negative magnetocaloric effect.”