Volume mismatch substitution in two Ce compounds (invited)

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Abstract
The crossover from a γ‐Ce‐like state to an α‐Ce state in Ce compounds has been subject of great interest in recent years. Here, we discuss two Ce compounds, CeAl2 and CePd3, which can be driven through a γ‐like to an α‐like transition via volume mismatch alloying. A nonlinear volume collapse coupled to two‐phase behavior is common to both alloy systems. In the γ‐like phase just before the volume collapse, spin fluctuations (probed by resistance measurements) with a characteristic energy scale TSF in the 10–50 K range are also common to both systems. For the CeAl2 based alloys, TSF is seen to increase rapidly and systematically with decreasing volume from well within the γ‐like to well into the α‐like phase.