Zobrazeno 1 - 10
of 271
pro vyhledávání: '"and Lima, O."'
Autor:
Sergeenkov, S., Cordova, C., Cichetto Jr, L., de Lima, O. F., Longo, E., Araujo-Moreira, F. M., Furtado, C.
We present a comparative study on the influence of applied magnetic field on the resistance of $C_{1-x}Co_x$ thin films (with $x=0.1$, $0.15$ and $0.2$) grown on $Si$ substrate by pulsed laser deposition technique. It is found that the behavior of ma
Externí odkaz:
http://arxiv.org/abs/1803.02064
Autor:
Sergeenkov, S., Cordova, C., Ari-Gur, P., Koledov, V. V., Kamantsev, A. P., Shavrov, V. G., Mashirov, A. V., Gomes, A. M., Takeuchi, A. Y., de Lima, O. F., Araujo-Moreira, F. M.
Publikováno v:
Philosophical Magazine Letters 96, 375 (2016)
We present our recent results on temperature behaviour of magnetization observed in Ni_47Mn_39In_14 Heusler alloys. Three regions can be distinguished in the M-T diagram: (I) low temperature martensitic phase (with the Curie temperature T_CM = 140 K)
Externí odkaz:
http://arxiv.org/abs/1708.08368
Autor:
Souza, N. S., Sergeenkov, S., Speglich, C., Rivera, V. A. G., Cardoso, C. A., Pardo, H., Mombru, A. W., Rodrigues, A. D., de Lima, O. F., Araujo-Moreira, F. M.
Publikováno v:
Applied Physics Letters 95, 233120 (2009)
We report the chemical synthesis route, structural characterization, and physical properties of nanofluid magnetic graphite (NFMG) obtained from the previously synthesized bulk organic magnetic graphite (MG) by stabilizing the aqueous ferrofluid susp
Externí odkaz:
http://arxiv.org/abs/0912.5344
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We have investigated the crystal structure and magnetic properties for polycrystalline samples of LaMn1-xFexO3+y, in the whole range x=0.0 to x=1.0, prepared by solid state reaction in air. All samples show the ORT-2 orthorhombic structure that suppr
Externí odkaz:
http://arxiv.org/abs/0804.4250
Autor:
Cardoso, C. A., Lanfredi, A. J. C., Chiquito, A. J., Awana, V. P. S., Kishan, H., de Almeida, R. L., de Lima, O. F., Araujo-Moreira, F. M.
The magnetic and superconducting properties of RuSr2Gd1.5Ce0.5Cu2O10-x polycrystalline samples with different oxygen doping level are presented. A strong suppression of the superconducting temperature (Tc), as well as a reduction in the superconducti
Externí odkaz:
http://arxiv.org/abs/cond-mat/0502674
The search for macroscopic magnetic ordering phenomena in organic materials, in particular in pure graphite, has been one of the more exciting scientific activities working in the frontiers of physics, chemistry, and materials science. In this Letter
Externí odkaz:
http://arxiv.org/abs/cond-mat/0408441
Autor:
Pardo, H., Araujo-Moreira, F. M., Faccio, R., de Lima, O. F., Lanfredi, A. J. C., Cardoso, C. A., Leite, E. R., Zanelatto, G., Mombru, A. W.
Carbon materials are attracting increasing attention due to the novelty of the associated physical properties and the potential applications in high-tech devices. The possibility to achieve outstanding properties in macroscopic carbon materials opens
Externí odkaz:
http://arxiv.org/abs/cond-mat/0407303
We present the temperature dependence of the specific heat, without external magnetic field and with H= 9 T, for LaMnO3, La1.35Sr1.65Mn2O7, La1.5Sr0.5NiO4 and La1.5Sr0.5CoO4 single crystals. We found that spin-wave excitations in the ferromagnetic an
Externí odkaz:
http://arxiv.org/abs/cond-mat/0404596
Autor:
Cardoso, C. A., Araujo-Moreira, F. M., Andreeta, M. R. B., Hernandes, A. C., Leite, E. R., de Lima, O. F., Mombru, A. W., Faccio, R.
We have grown high-quality single crystals of the colossal-magnetoresistance (CMR) material La0.7Ca0.3MnO3 by using the laser heated pedestal growth (LHPG) method. Samples were grown as fibers of different diameters, and with lengths of the order of
Externí odkaz:
http://arxiv.org/abs/cond-mat/0308245