Abstract
Spectroscopic, magnetic, thermal, and transport measurements under pressure are presented which were performed on intermetallics. The substitution of Cu by Al in drives the system from an almost divalent behavior of the Yb ion in to a trivalent state in . A compensation between the normal thermal expansion and a valence-driven contraction was found for . Antiferromagnetic order sets in for , where an increasing Al content causes both a growing transition temperature and rising saturation moments reaching 2 K and about 2.1 respectively, for . At the critical concentration the possibility of a non-Fermi-liquid state is analyzed together with its tuning by pressure.
- Received 12 December 1996
DOI:https://doi.org/10.1103/PhysRevB.56.711
©1997 American Physical Society