Abstract
The interplay between the Mn interlayer coupling constant and the thermal expansion has been investigated by means of thermal-expansion, specific-heat, and magnetization measurements. A linear relation between and the thermal expansion was established. This linear relation is used in the formulation of a quantitative model for temperature-induced metamagnetic transitions in R compounds. The observed relation between the unit-cell dimensions and the transition temperatures is interpreted in terms of this model. For polycrystalline , the relation between the metamagnetic transitions and anomalies in the electrical resistivity was investigated. A magnetic-field-induced change of the resistance of 10% was observed at 185 K. It appears likely that magnetovolume effects are responsible for the anomalous resistance behavior.
- Received 14 June 1994
DOI:https://doi.org/10.1103/PhysRevB.50.16410
©1994 American Physical Society