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Ernesto Govea Alcaide | Universidad de Oriente - Cuba

Grant number: 09/51562-3
Support type:Research Grants - Visiting Researcher Grant - International
Duration: September 28, 2009 - November 25, 2009
Field of knowledge:Physical Sciences and Mathematics - Physics
Principal Investigator:Renato de Figueiredo Jardim
Grantee:Renato de Figueiredo Jardim
Visiting researcher: Ernesto Govea Alcaide
Visiting researcher institution: Universidad de Oriente, Cuba
Home Institution: Instituto de Física (IF). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Associated research grant:05/53241-9 - Study of intergranular phenomena in ceramic materials, AP.TEM


In the last research plan we have obtained bi1.64Pb0.64Sr2Ca2Cu3Oy (Bi-2223) samples which, by using the scherer formula, are composed by grains with sizes ranging from 20 nm to 5μm. Preliminary magnetic measurements indicated that: (i) as the size of grains decreases, the superconducting transition begins to branch out and (ii) for temperatures lower than a certain value, Teff, the magnetic susceptibility as a function of temperature shows a paramagnetic-like behavior transport and magnetic properties of the Bi-2223 nanoparticles. We will concentrate efforts for determining the grain size distribution of samples. The main point here is to correlate the above mentioned distribution with the transport and magnetic properties in order to search for crossover from bulk to few-electron limit in small superconducting grains. (AU)

Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
GARCIA-FORNARIS, I.; PLANAS, A. A.; MUNE, P.; JARDIM, R. F.; GOVEA-ALCAIDE, E. Temperature Dependence of the Intergranular Critical Current Density in Uniaxially Pressed Bi1.65Pb0.35Sr2Ca2Cu3O10+delta Samples. Journal of Superconductivity and Novel Magnetism, v. 23, n. 8, p. 1511-1516, DEC 2010. Web of Science Citations: 5.
GARCIA-FORNARIS, I.; GOVEA-ALCAIDE, E.; ALBERTERIS-CAMPOS, M.; MUNE, P.; JARDIM, R. F. Transport Barkhausen-like noise in uniaxially pressed Bi1.65Pb0.35Sr2Ca2Cu3O10+delta ceramic samples. PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, v. 470, n. 15-16, p. 611-616, AUG 1 2010. Web of Science Citations: 3.
GARCIA-FORNARIS, I.; GOVEA-ALCAIDE, E.; MUNE, P.; JARDIM, R. F. Intergranular properties of uniaxially pressed YBa2Cu3O7-delta ceramic samples. REVISTA MEXICANA DE FISICA, v. 56, n. 1, p. 40-43, FEB 2010. Web of Science Citations: 0.

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