Pressure effect on magnetic behavior and lattice softening in CeCo 4B
Abstract
We have performed thermal expansion studies of CeCo 4B at pressures up to 13 kbar and magnetization studies up to 11 kbar in the field range up to 50 kOe at temperatures between 5 and 300 K. The transition temperature, Tt, of the iso-structural transition is defined by the maximum of the linear thermal expansion coefficient. Tt increases with pressure ( Tt =122 K at ambient pressure) and reaches the value Tt=190 K at 12 kbar. A significant lattice softening is observed. The anomalies observed in the thermal evolution of the magnetization at temperatures close to Tt are significantly enhanced under pressure. The pressure induced changes in the hybridization of the 3d-4f states and the changes in the antiparallel alignment of the Ce and Co moments are considered to be at the origin of the observed peculiar behavior of CeCo 4B under pressure.
- Publication:
-
Physica B Condensed Matter
- Pub Date:
- April 2003
- DOI:
- 10.1016/S0921-4526(02)01730-1
- Bibcode:
- 2003PhyB..327..211A