Abstract
Polycrystalline samples of nonoriented bulk YBaCuO superconducting specimens display high degree of disorder, semiconducting behavior in the normal state, and broad transition temperature. A regime explaining electrical and magnetic behaviors of high critical temperature superconductors called thermally activated flux flow (TAFF) presents a state in which vortex dynamic exhibits an ohmic behavior. The resistivity in this regime is proportional to the applied magnetic field for small current densities. In this work is presented a systematic study of the magnetoresistance as a function of the applied magnetic field in the range 5 to 100 Oe for polycrystalline samples with various thickness. Results of X-ray diffraction, resistivity as a function of the temperature, I-V characteristic curves and magnetoresistance are shown. The later result was fitted through an ad-hoe model showing good agreement in the 5 to 100 Oe magnetic field range.
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