Pressure Dependence of the Valence Phase Transition in YbInCu_4
The valence phase transition of YbInCu<SUB>4</SUB> has been investigated by neutron diffraction and high pressure experiments. Rietveld refinement of the crystal structure has showed that the transition occurs with no change in crystal symmetry in a temperature range of about 35-50 K. The transition temperature T<SUB>v</SUB> decreases linearly at a rate of -17 K/GPa with increasing the pressure up to 1 GPa, above which it decreases much faster up to 1. 75GPa. By using the bulk modules of YbInCu<SUB>4</SUB>, a Grüneisen type parameter of η=dln (T<SUB>v</SUB>) /dln (V (p) ), which represents the dependence of T<SUB>v</SUB> on the volume V (p) is estimated as -64. This value of η is discussed in a relation to the Kondo volume collapse model for the α-γ transition of Ce metal.
- 高圧力の科学と技術 = The Review of high pressure science and technology
高圧力の科学と技術 = The Review of high pressure science and technology 7, 635-637, 1998
The Japan Society of High Pressure Science and Technology