Chapter 3. Kondo lattice and heavy-fermion behaviour, magnetic ordering, superconductivity, mixed valence, quadrupolar ordering and other aspects in rare earth intermetallic
Development of magnetic order in CeCu2(Si1−xGex)2

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Abstract

Measurements of specific heat (CP), AC and DC susceptibility, and resistivity were carried out on samples of CeCu2(Si1−xGex)2. The system evolves continuously from the heavy fermion state at x = 0 to an antiferromagnetically (AF) ordered state at x = 1, although the magnetic structure undergoes significant modifications. The results strongly suggest that the AF-ordering emerges from the A-phase of CeCu2Si2. Below the ordering temperature a systematic change in curvature in CP(T) is observed for x ⩾ 0.6, that gets more pronounced with decreasing x, and at x = 0.4 a sharp anomaly is observed suggesting the existence of a critical point for 0.3 < x < 0.5. Below 1 K, a small anomaly is present at some concentrations. The results are compared with those on the Ce(Cu1−xNix)2Ge2 system.

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