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Metal-insulator transition in Nd1-xEuxNiO3 probed by specific heat and anelastic measurements (Articolo in rivista)

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Metal-insulator transition in Nd1-xEuxNiO3 probed by specific heat and anelastic measurements (Articolo in rivista) (literal)

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V. B. Barbeta (1); R. F. Jardim (2); M. S. Torikachvili (3); M. T. Escote (4); F. Cordero (5); F. M. Pontes (6); F. Trequattrini (7) (2011)
Metal-insulator transition in Nd1-xEuxNiO3 probed by specific heat and anelastic measurements
in Journal of applied physics; American Institute Of Physics (AIP), Melville (Stati Uniti d'America)
(literal)

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V. B. Barbeta (1); R. F. Jardim (2); M. S. Torikachvili (3); M. T. Escote (4); F. Cordero (5); F. M. Pontes (6); F. Trequattrini (7) (literal)

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1 Departamento de Física, Centro Universitário da FEI, São Bernardo do Campo, 09850-901, Brazil 2 Instituto de Física, Universidade de São Paulo, CP 66318, São Paulo, 05315-970, Brazil 3 Department of Physics, San Diego State University, San Diego, California 92182-1233, USA 4 Centro de Engenharia, Modelagem e Ciências Sociais Aplicadas, Universidade Federal do ABC, Santo André, 09210-170, Brazil 5 CNR-ISC, Istituto dei Sistemi Complessi, Via del Fosso del Cavaliere 100, 00133, Rome, Italy 6 Departamento de Química, Universidade Estadual Paulista, Bauru, 17033-360, Brazil 7 Physics Department, University of Roma \"La Sapienza\", P.le A. Moro 5, 00185, Rome, Italy (literal)

Titolo

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

Abstract

Oxides RNiO3 (R - rare-earth, R not equal La) exhibit a metal-insulator (MI) transition at a temperature T-MI and an antiferromagnetic (AF) transition at T-N. Specific heat (C-P) and anelastic spectroscopy measurements were performed in samples of Nd1-xEuxNiO3, 0 <= x <= 0.35. For x - 0, a peak in C-P is observed upon cooling and warming at essentially the same temperature T-MI - T-N similar to 195 K, although the cooling peak is much smaller. For x >= 0.25, differences between the cooling and warming curves are negligible, and two well defined peaks are clearly observed: one at lower temperatures that define T-N, and the other one at T-MI. An external magnetic field of 9 T had no significant effect on these results. The elastic compliance (s) and the reciprocal of the mechanical quality factor (Q(-1)) of NdNiO3, measured upon warming, showed a very sharp peak at essentially the same temperature obtained from C-P, and no peak is observed upon cooling. The elastic modulus hardens below T-MI much more sharply upon warming, while the cooling and warming curves are reproducible above T-MI. Conversely, for the sample with x - 0.35, s and Q(-1) curves are very similar upon warming and cooling. The results presented here give credence to the proposition that the MI phase transition changes from first to second order with increasing Eu doping. (literal)

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