Search Results - "das Neves Vieira, Valdemar"

Comparison Between the Magnetic Irreversibility and Zero Resistance of High-Quality Melt-Processed YBaCuO Superconductors by Teixeira Dias, Fabio, das Neves Vieira, Valdemar, Wolff-Fabris, Frederik, Kampert, Erik, Hneda, Marlon, Schaf, Jacob, Farinela, Graziele Fernanda, de Paiva Gouvea, Cristol, Roa Rovira, Joan Josep

“…This paper portrays a detailed study of the magnetic irreversibility limit T irr (H) and of the zero resistance point T c0 (H) of three different top-seeding…”
Get full text

Magnetic irreversibility: An important amendment in the zero-field-cooling and field-cooling method by Dias, Fábio Teixeira, Vieira, Valdemar das Neves, Nunes, Sabrina Esperança, Pureur, Paulo, Schaf, Jacob, Farinela da Silva, Graziele Fernanda, Gouvêa, Cristol de Paiva, Wolff-Fabris, Frederik, Kampert, Erik, Obradors, Xavier, Puig, Teresa, Rovira, Joan Josep Roa

“…The present work reports about experimental procedures to correct significant deviations of magnetization data, caused by magnetic relaxation, due to small…”
Get full text

Possible weakly first-order superconducting transition induced by magnetic excitations in the YBCO system: A fluctuation conductivity study by Hneda, Marlon Luiz, da Silva Berchon, Luciano, Pureur, Paulo, das Neves Vieira, Valdemar, Jaeckel, Sandra Teixeira, Dias, Fábio Teixeira, Menegotto Costa, Rosângela

“…Fluctuation conductivity is experimentally studied in the genuine critical region near the superconducting transition of YBa2Cu3O7−δ, YBa2Cu2.985Fe0.015O7−δ…”
Get full text

Quasi-one-dimensional nanostructured cobalt (Co) intercalated vanadium oxide (V2O5): Peroxovanadate sol gel synthesis and structural study by da Silva, Douglas Langie, Moreira, Eduardo Ceretta, Dias, Fábio Teixeira, Neves Vieira, Valdemar das, Brandt, Iuri Stefani, Cas Viegas, Alexandre da, Pasa, André Avelino

“…Nanostructured cobalt vanadium oxide (V2O5) xerogels spread onto crystalline Si substrates were synthesized via peroxovanadate sol gel route. The resulting…”
Get full text

Critical Conductivity Fluctuations of YBa2Cu2.985Fe0.015O7―δ Single Crystal by HNEDA, Marlon Luiz, DAS NEVES VIEIRA, Valdemar, DA SILVA BERCHON, Luciano, COSTA, Rosângela Menegotto

Get full text

Kinetic Energy Density Induced by High Magnetic Fields in a Bi-2212 Single Crystal by de Almeida, Moisés Leonardi, Pureur, Paulo, Teixeira Dias, Fábio, das Neves Vieira, Valdemar

“…We have measured isofield curves for the kinetic energy density ( E k ) in the superconducting state of a Bi 2 Sr 2 CaCu 2 O 8+ δ (Bi-2212) single crystal…”
Get full text

Fluctuation conductivity along the c-axis and parallel to the ab-planes in melt-textured YBa2Cu3O7−δ samples doped with Y211 phase by Teixeira Dias, Fábio, Vieira, Valdemar das Neves, Pureur, Paulo, Rodrigues, Pedro, Obradors, Xavier

“…We report measurements of in-plane and out-of-plane fluctuation conductivity under low applied magnetic fields up to 500Oe in two melt-textured YBa2Cu3O7−δ…”
Get full text

Paramagnetic Meissner effect and strong time dependence at high fields in melt-textured high-TC superconductors by de Paiva Gouvêa, Cristol, Dias, Fábio Teixeira, das Neves Vieira, Valdemar, da Silva, Douglas Langie, Schaf, Jacob, Wolff-Fabris, Frederik, Rovira, Joan Josep Roa

“…In this work we report on systematic field-cooled magnetization experiments in melt-textured YBa 2 Cu 3 O 7− δ samples containing Y211 precipitates. Magnetic…”
Get full text

Critical Conductivity Fluctuations of [Formula Omitted] Single Crystal by Hneda, Marlon Luiz, Vieira, Valdemar das Neves, Berchon, Luciano da Silva, Costa, Rosangela Menegotto

“…We have studied experimentally the in-plane conductivity fluctuations, [Formula Omitted], of a [Formula Omitted] [Formula Omitted] single crystal. Different DC…”
Get full text

Critical Conductivity Fluctuations of \hbox\hbox\hbox\hbox Single Crystal by Hneda, Marlon Luiz, Vieira, Valdemar das Neves, Berchon, Luciano da Silva, Costa, Rosangela Menegotto

“…We have studied experimentally the in-plane conductivity fluctuations, Δσ(T), of a YBa 2 (Cu 1-x Fe x ) 3 O 7-δ (x=0.005) single crystal. Different DC magnetic…”
Get full text

Quasi-one-dimensional nanostructured cobalt (Co) intercalated vanadium oxide (V sub(2)O sub(5)): Peroxovanadate sol gel synthesis and structural study by da Silva, Douglas Langie, Moreira, Eduardo Ceretta, Dias, Fabio Teixeira, Vieira, Valdemar das Neves, Brandt, Iuri Stefani, Viegas, Alexandre da Cas, Pasa, Andre Avelino

“…Nanostructured cobalt vanadium oxide (V sub(2)O sub(5)) xerogels spread onto crystalline Si substrates were synthesized via peroxovanadate sol gel route. The…”
Get full text

High-field paramagnetic Meissner effect up to 14 T in melt-textured YBa2Cu3O7-delta by Teixeira Dias, Fábio, Vieira, Valdemar das Neves, Wolff-Fabris, Frederik, Kampert, Erik, Paiva Gouvêa, Cristol de, Campos, A.P.C, Archanjo, B.S, Schaf, Jacob, Obradors Berenguer, Xavier, Puig, T, Roa Rovira, Joan Josep, Sahoo, B.K

“…We have performed magnetization experiments in a melt-textured YBa2Cu3O7-delta(Y123) sample with Y2BaCuO5 (Y211) inclusions, under magnetic fields up to 14 T…”
Get full text

Fluctuation conductivity along the c-axis and parallel to the ab-planes in melt-textured YBa(2)Cu(3)O(7-)(d)) samples doped with Y211 phase by Dias, Fabio Teixeira, Vieira, Valdemar das Neves, Pureur, Paulo, Rodrigues, Pedro, Obradors, Xavier

“…We report measurements of in-plane and out-of-plane fluctuation conductivity under low applied magnetic fields up to 500 Oe in two melt-textured…”
Get full text

Fluctuation conductivity along the c-axis and parallel to the ab-planes in melt-textured YBa2Cu3O7− samples doped with Y211 phase by Teixeira Dias, Fábio, Vieira, Valdemar das Neves, Pureur, Paulo, Rodrigues, Pedro, Obradors, Xavier

Get full text

Paramagnetic Meissner effect and strong time dependence at high fields in melt-textured high-T C superconductors by de Paiva Gouvêa, Cristol, Dias, Fábio Teixeira, das Neves Vieira, Valdemar, da Silva, Douglas Langie, Schaf, Jacob, Wolff-Fabris, Frederik, Rovira, Joan Josep Roa

Get full text

Chemical introduced disorder effects on the critical current density and pinning mechanisms of YBa2-XSrXCu3O7- by Flores, R. L, Vieira, Valdemar das Neves, Teixeira Dias, Fábio, Pureur, P, Schaf, Jacob, Hneda, M, Roa Rovira, Joan Josep

“…We report on isotherm ( T = 77.5 K) DC magnetization hysteresis loops of a series of YBa 2 -x Sr x Cu 3 O 7 - ¿ (x = 0, 0.02, 0.1, 0.25 and 0.37) single…”
Get full text

Functional behaviour of the anomalous magnetic relaxation observed in melt-textured YBCO samples showing the paramagnetic Meissner effect by Teixeira Dias, Fábio, Vieira, Valdemar das Neves, Garcia, E.L, Wolff-Fabris, Frederik, Kampert, Erik, Paiva Gouvêa, Cristol de, Schaf, Jacob, Obradors Berenguer, Xavier, Puig, Teresa, Roa Rovira, Joan Josep

“…We have studied the functional behavior of the field-cooled (FC) magnetic relaxation observed in melt- textured YBa 2 Cu 3 O 7- d(Y123) samples with 30 wt% of…”
Get full text