Cobalt substitution tunes EuRh2Si2 from an antiferromagnet through a sharp valence transition to a smooth crossover, with the critical endpoint between x=0.119 and x=0.166.
6(a), the heat capacity as a function of temper- ature is shown for a sample with xEDX = 0.126
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Towards a critical endpoint in the valence fluctuating Eu(Rh$_{1-x}$Co$_{x}$)$_2$Si$_2$ system
Cobalt substitution tunes EuRh2Si2 from an antiferromagnet through a sharp valence transition to a smooth crossover, with the critical endpoint between x=0.119 and x=0.166.