Abstract
The phase transition in () and has been systematically investigated by the electrical-transport method. The composition dependence of the transition temperature in determined from an electrical resistivity anomaly is in good agreement with other experiments. We found that the resistivity-anomaly peak position increases with a reduction of the anomaly under a strong magnetic field in () and (). The magnetic field dependence is tentatively explained by an interband-electron—TO-phonon coupling model, taking into account the phonon anharmonicity.
- Received 1 March 1979
DOI:https://doi.org/10.1103/PhysRevB.20.2823
©1979 American Physical Society