Abstract
In compounds with normal rare earths at the same crystallographic site, mixed magnetic phases with two distinct rare-earth magnetic states, namely, a zero moment one and another with a high moment, can be stabilized at low temperature not only in zero applied field but also in different field-induced magnetic phases of a metamagnetic process. These characteristics are observed in tetragonal ${\mathrm{TbRu}}_{2}{\mathrm{Ge}}_{2}$ from neutron diffraction and magnetization measurements on a single crystal. It is shown that such magnetic structures may originate from a moment instability due to the crystal field in the presence of frustrated exchange interactions. Numerical simulations using the periodic-field model allowed us to satisfactorily account for the observed properties and emphasize the crucial role played by the crystal field.
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