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Oxides RNiO3 (R = rare-earth, R # La) exhibit a metal-insulator (MI)transition at a temperature TMI and an antiferromagnetic (AF) transition at TN.Specific heat (CP) and anelastic spectroscopy measurements were performed insamples of Nd1-xEuxNiO3, 0 <= x <= 0.35. For x = 0, a peak in CP is observedupon cooling and warming at essentially the same temperature TMI = TN ~ 195 K,although the cooling peak is much smaller. For x >= 0.25, differences betweencooling and warming curves are negligible, and two well defined peaks areclearly observed: one at lower temperatures, that define TN, and the other oneat TMI. An external magnetic field of 9 T had no significant effect on theseresults. The elastic compliance (s) and the reciprocal of the mechanicalquality factor (Q^-1) of NdNiO3, measured upon warming, showed a very sharppeak at essentially the same temperature obtained from CP, and no peak isobserved upon cooling. The elastic modulus hardens below TMI much more sharplyupon warming, while the cooling and warming curves are reproducible above TMI.On the other hand, for the sample with x = 0.35, s and Q^-1 curves are verysimilar upon warming and cooling. The results presented here give credence tothe proposition that the MI phase transition changes from first to second orderwith increasing Eu doping.

Metal-insulator transition in Nd1-xEuxNiO3 probed by specific heat and anelastic measurements