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Anelastic spectroscopy study of the metal-insulator transition of Nd1-xEuxNiO3 (Articolo in rivista)

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Anelastic spectroscopy study of the metal-insulator transition of Nd1-xEuxNiO3 (Articolo in rivista) (literal)

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F. Cordero (1); F. Trequattrini (2); V. B. Barbeta (3); R. F. Jardim (4); M. S. Torikachvili (5) (2011)
Anelastic spectroscopy study of the metal-insulator transition of Nd1-xEuxNiO3
in Physical review. B, Condensed matter and materials physics; American Physical Society (APS), College Pk (Stati Uniti d'America)
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F. Cordero (1); F. Trequattrini (2); V. B. Barbeta (3); R. F. Jardim (4); M. S. Torikachvili (5) (literal)

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1 CNR-ISC, Istituto dei Sistemi Complessi, Area della Ricerca di Roma - Tor Vergata, Via del Fosso del Cavaliere 100, I-00133 Roma, Italy 2 Dipartimento di Fisica, Università di Roma \"La Sapienza\", P. le A. Moro 2, I-00185 Roma, Italy 3 Departamento de Fisica, Centro Universit´ario da FEI, Sao Bernardo do Campo, 09850-901, Brazil 4 Instituto de Fisica, Universidade de Sao Paulo, CP 66318, Sao Paulo, 05315-970, Brazil 5 Department of Physics, San Diego State University, San Diego, California 92182-1233, USA (literal)

Titolo

Anelastic spectroscopy study of the metal-insulator transition of Nd1-xEuxNiO3 (literal)

Abstract

Measurements are presented of the complex dynamic Young's modulus of NdNiO3 and Nd0.65Eu0.35NiO3 through themetal-insulator transition (MIT). Upon cooling, the modulus presents a narrowdip at theMIT followed by an abrupt stiffening of ~6%. The anomaly is reproducible between cooling and heating in Nd0.65Eu0.35NiO3 but appears only as a slow stiffening during cooling in undoped NdNiO3, in conformance with the fact that the MIT in RNiO3 changes from strongly first order to second order when the mean R size is decreased. The elastic anomaly seems not to be associated with the antiferromagnetic transition, which is distinct from the MIT in Nd0.65Eu0.35NiO3 . It is concluded that the steplike stiffening is due to the disappearance or freezing of dynamic Jahn-Teller (JT) distortions through theMIT, where the JT active Ni3+ is disproportionated into alternating Ni3+? and Ni3-? . The fluctuating octahedral JT distortion necessary to justify the observed jump in the elastic modulus is estimated as ~3% but does not have a role in determining the MIT, since the otherwise-expected precursor softening is not observed. (literal)

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