Abstract
Long-range magnetic order can be induced in the heavy-fermion compound CeRu 2Si 2 by slightly expanding the unit-cell volume through alloying (La substituted for Ce, or Ge for Si). The resulting magnetic state has been investigated in (Ce 0.8La 0.2)Ru 2Si 2 and CeRu 2(Si 0.9Ge 0.1) 2 single crystals by neutron-scattering experiments, as a function of temperat ure and magnetic field. very similar phase diagrams, consisting of various regions with either commensurate or incommensurate modulations of the Ce moments, are obtained for both alloys. The second magnetic transition below T N that occurs at H = 0 in (Ce 0.8La 0.2)Ru 2Si 2 appears to be closely related to the persistence of short-range magnetic fluctuations in the ordered state of this material. It is suggested that the leading effect may be a locking of the phase of the modulation.
Published Version
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