Abstract
Abstract. - Magnetostriction and thermal expansion measurements on CeAI, in and near the antiferroma- gnetic (AF) phase have established (1) the AF phase boundary in the H-T plane ; (2) the nature of the reorienta- tion of the AF domains in field, the evolution of the AF order parameter in field and the nature of the AF fluc- tuations above T, ; and (3) that the magnetic exchange between Ce atoms is ferromagnetic in large fields. Inelastic neutron scattering measurements reveal a new and yet unexplained feature at 17.5 meV. (*) Research supported in part by the Army Research Office The compound CeA1, is an Anderson lattice system in the local moment regime, which appears to display a competition between spin fluctuations and indirect 100- magnetic exchange. In this paper we summarize the results of an extensive study of the macroscopic thermodynamic properties of CeAI, and present 80- some preliminary results of an ongoing neutron scattering study.
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