随着温度的降低,系统首先通过顺磁态至铁磁态的转变,再发生铁磁态至自旋玻璃的转变。这一自旋玻璃的重入现象引起实验及理论工作者的广泛兴趣。在三轴谱仪上用中子粉末衍射方法测量了尖晶石(Ni_(0.75)Zn_(0.25))(Cr_(0.75)Al_(0.25))_2O_4室温及14K的结构,均未发现磁衍射峰,说明在这两个温度上系统均不 As the temperature decreases, the system first undergoes the transition from paramagnetism to ferromagnetism and then the transition from ferromagnetic state to spin-on glass. The re-entry of this spinning glass has attracted a great deal of interest from experimental and theoretical workers. The structures of the spinel (Ni 0.75 Zn 0.25 (Cr 0.75 Al 0.25) 2 O 4 at room temperature and 14K were measured by the neutron powder diffraction method on a three-axis spectrometer. None of the magnetic diffraction peaks , Indicating that the system at both temperatures are not