Abstract
We report here experimental data on the crystal-field interaction of gadolinium ions with their environment in . The ESR spectrum and a Schottky anomaly in the specific heat of dilute samples () indicate the existence of a crystal-field splitting of the ground state of ions of about 1.5 K. We discuss the parametrization of the measured splitting in terms of an effective Hamiltonian, and the microscopic origin of the interaction within the framework of a superposition model. Since the single-ion energies involved are of the same order of magnitude as the energies associated with the magnetic ordering of the moments in ( K), we analyze the effects of the crystal-field interaction on the magnetic transition.
- Received 16 December 1987
DOI:https://doi.org/10.1103/PhysRevB.38.257
©1988 American Physical Society