Zobrazeno 1 - 10
of 119
pro vyhledávání: '"V. N. Vieira"'
Publikováno v:
IEEE Transactions on Magnetics. 57:1-5
This communication reports an electrical magnetoconductivity fluctuation study in polycrystalline (granular) samples of YBa2Cu2.985Fe0.015O $_{\mathrm {7-\delta}}$ and YBa1.75Sr0.25Cu3O $_{\mathrm {7-\delta }}$ superconductors. The measurements were
Autor:
M. L. Hneda, Jacob Schaf, F Mesquita, Fábio Teixeira Dias, S.T. Jaeckel, Paulo Pureur, V. N. Vieira
Publikováno v:
IEEE Transactions on Magnetics. 57:1-5
In this article, we investigated the effects of chemical doping on the diamagnetic thermodynamic fluctuations (DTFs) of YBa2Cu2.97X0.03O $_{7-\delta}$ (X = Au, Ni, Zn, and Mg) single crystals. In-plane dc zero field cooled [ $M_{\mathrm {ZFC}}(T)$ ]
Publikováno v:
Physics Letters A. 383:2519-2524
We report on magnetization experiments from which we obtain the field-induced kinetic energy density, E k , in the superconducting phase of several Bi2Sr2CaCu2O 8 + δ single crystal samples. The kinetic energy magnitude changes according to the char
Publikováno v:
Physica B: Condensed Matter. 536:855-859
We report on measurements of the c-axis component of the magnetic susceptibility in the normal phase of several single crystal samples of the Bi2Sr2CaCu2O8+δ cuprate superconductor. These crystal were submitted to appropriate heat treatments so that
Autor:
Sandra Teixeira Jaeckel, Luciano da Silva Berchon, Fábio Teixeira Dias, V. N. Vieira, Paulo Pureur, M. L. Hneda, Rosângela Menegotto Costa
Publikováno v:
Physics Letters A. 381:1255-1260
Fluctuation conductivity is experimentally studied in the genuine critical region near the superconducting transition of YBa 2 Cu 3 O 7 − δ , YBa 2 Cu 2.985 Fe 0.015 O 7 − δ and Y 0.95 Ca 0.05 Ba 2 Cu 3 O 7 − δ single crystal samples. Two fl
Gaussian and critical scalings in the magnetoconductivity fluctuations of Y3Ba5Cu8O18 superconductor
Autor:
F Mesquita, Frederik Wolff-Fabris, C. P. Oliveira, V. N. Vieira, Fábio Teixeira Dias, J. R. Lima, Erik Kampert, Douglas Langie da Silva, Paulo Pureur
We have studied the superconducting transition and the magnetoconductivity fluctuations in the polycrystalline Y3Ba5Cu8O[Formula: see text] (Y358) superconductor under magnetic fields upto 1 T. A two-step superconducting transition could be observed
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::387d0f72cc9c1b1ff29431adeb7c9ae4
http://wrap.warwick.ac.uk/114298/7/WRAP-Gaussian-critical-scalings-magnetoconductivity-fluctuations-Kampert-2018.pdf
http://wrap.warwick.ac.uk/114298/7/WRAP-Gaussian-critical-scalings-magnetoconductivity-fluctuations-Kampert-2018.pdf
Autor:
Jacob Schaf, Fábio Teixeira Dias, Cristol de Paiva Gouvêa, Paulo Pureur, V. N. Vieira, M. L. Hneda
Publikováno v:
IEEE Transactions on Applied Superconductivity. 26:1-4
We report on dc magnetization data collected from a modified superficial pinning potential YBa 2 Cu 3 O 7-δ single crystal with the goal of checking the majority contribution of the magnetic flux compression scenario to the high-field paramagnetic M
Autor:
V. N. Vieira, Iuri S. Brandt, Eduardo Ceretta Moreira, Alexandre da Cas Viegas, Fábio Teixeira Dias, Douglas Langie da Silva, André A. Pasa
Publikováno v:
Journal of Solid State Chemistry. 221:116-125
Nanostructured cobalt vanadium oxide (V 2 O 5 ) xerogels spread onto crystalline Si substrates were synthesized via peroxovanadate sol gel route. The resulting products were characterized by distinct experimental techniques. The surface morphology an
Publikováno v:
Journal of Superconductivity and Novel Magnetism. 28:411-414
We have measured isofield curves for the kinetic energy density (E k) in the superconducting state of a Bi2Sr2CaCu2O8+δ (Bi-2212) single crystal. These curves were determined from magnetization versus temperature experiments that were analyzed accor
Publikováno v:
IEEE Transactions on Magnetics. 49:4638-4642
We have studied experimentally the in-plane conductivity fluctuations, Δσ(T), of a YBa2(Cu1-xFex)3O7-δ (x=0.005) single crystal. Different DC magnetic fields (H ≤ 500 Oe) and current densities (J ≤ 209 A/cm-2) intensities were applied parallel