Výsledky vyhledávání - "Barbeta, V. B."

Akademický článek

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Anelastic spectroscopy study of the metal-insulator transition of Nd(1-x)EuxNiO3

Autor: Cordero, F., Trequattrini, F., Barbeta, V. B., Jardim, R. F., Torikachvili, M. S.

Publikováno v: Phys. Rev. B 84, 125127 (2011)

Measurements are presented of the complex dynamic Young's modulus of NdNiO3 and Nd0.65Eu0.35NiO3 through the Metal-Insulator Transition (MIT). On cooling, the modulus presents a narrow dip at the MIT followed by an abrupt stiffening of ~6%. The anoma

Externí odkaz: http://arxiv.org/abs/1108.3192

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Dissertation/ Thesis

Efeitos da introdução de desordem nos sistemas antiferromagnéticos A2e1-xlnxC5.H2O (A= K, Rb) e (Nd1-xSmx)2Cu04

Autor: Barbeta, V. B.

Publikováno v: Biblioteca Digital de Teses e Dissertações da FEICentro Universitário da Fundação Educacional InacianaFEI.

Tese (Doutorado) - Universidade de São Paulo, São Paulo, 1995

Externí odkaz: http://sofia.fei.edu.br:8080/pergamumweb/vinculos/000037/0000377c.pdf

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

Autor: Barbeta, V. B., Jardim, R. F., Torikachvili, M. S., Escote, M. T., Cordero, F., Pontes, F. M., Trequattrini, F.

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 in samples of Nd1-xEuxNiO3,

Externí odkaz: http://arxiv.org/abs/1010.4414

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Magnetic properties of Fe3O4 nanoparticles coated with oleic and dodecanoic acids

Autor: Barbeta, V. B., Jardim, R. F., Kiyohara, P. K., Effenberger, F. B., Rossi, L. M.

Magnetic nanoparticles (NP) of magnetite (Fe3O4) coated with oleic acid (OA) and dodecanoic acid (DA) were synthesized and investigated through Transmission Electron Microscopy (TEM),magnetization M, and ac magnetic susceptibility measurements. The O

Externí odkaz: http://arxiv.org/abs/1004.2231

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Magnetothermopower in Nd1-xEuxNiO3 compounds

Autor: Barbeta, V. B., Jardim, R. F., Escote, M. T., Dilley, N. R.

We have measured magnetization M(T,H), electrical resistivity ro(T,H), thermal conductivity k(T,H), and thermopower S(T,H) of polycrystalline samples of Nd1-xEuxNiO3; 0 <= x <= 0.35; as a function of temperature and external magnetic field. The data

Externí odkaz: http://arxiv.org/abs/cond-mat/0703512

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Metal-insulator transition in Nd$_{1-x}$Eu$_{x}$NiO$_{3}$ compounds

Autor: Escote, M. T., Barbeta, V. B., Jardim, R. F., Campo, J.

Publikováno v: Journal of Physics: Condensed Matter 18 (2006), 6117-6132

Polycrystalline Nd$_{1-x}$Eu$_{x}$NiO$_3$ ($0 \leq x \leq 0.5$) compounds were synthesized in order to investigate the character of the metal-insulator (MI) phase transition in this series. Samples were prepared through the sol-gel route and subjecte

Externí odkaz: http://arxiv.org/abs/cond-mat/0606573

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