ZrV_2的结构相变与声子软化

CONSTRUCTING PHASE CHANGE AND PHONON SOFTENING FOR ZrV_2

摘要: <正> C-15结构化合物ZrV_2和HfV_2等超导材料,在120 K附近有一结构相变,同时伴有电阻率、磁化率和热容等物理性质的反常变化。X射线衍射结果表明,HfV_2由高温相到低温相的转变是立方相到正交相的转变。有趣的是,相同结构的化合物ZrV_2的结构相变却是由立方相到六角相的转变,而且实验已经证明ZrV_2和HfV_2的结构相变都

Abstract: Inelastic scattering neutron spectra for ZrV_2 are measured at room and lowtemperatures using Be Filter Detector Spectrometer. One of the optical branches isfound to be soft. It is possible that soft mode phase change occures for ZrV_2from high T cube phase to low hexagon phase. This is favarable for superconduc-tivity of ZrV_2.