Abstract
Substitutions of Cu by Ga in stabilize the hexagonal structure and cause a crossover from a divalent behavior of the Yb-ion in to an almost 3+ state of Yb in . This gain of magnetism is accompanied by a noticeable enhancement of the electronic contribution to the specific heat. External pressure transforms those compounds, exhibiting intermediate valence, to a state which is best described in terms of the Kondo lattice model.
- Received 7 March 1995
DOI:https://doi.org/10.1103/PhysRevB.52.4327
©1995 American Physical Society