A multichannel averager technique for current-voltage measurements in high- superconductors

Martínez, C.; Flores, L.; Hernandez, Alexander D.

doi:10.1088/0957-0233/9/10/021

Cited by 1 publication

(1 citation statement)

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“…In our measurements, the current through the sample follows a triangular bipolar waveform and is measured by a data acquisition board as an index to a memory array where the sample voltage is averaged. In this way, we avoided thermo-emf and offset errors while the noise was properly attenuated depending on the number of scans of the bias current [21].…”

Section: Methodsmentioning

confidence: 99%

Self-field effects on critical current density and current-voltage characteristics in superconducting YBaCuO thick films

Hernandez

Hart

Martínez

et al. 1999

Supercond. Sci. Technol.

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The self-field and percolative influences on transport measurements of polycrystalline bridges engraved on YBaCuO thick film have been investigated. A maximum in the dependence of the critical current density on cross-sectional area of the bridge (A = 0.003 mm2-0.3 mm2) has been found experimentally, in samples with low critical current densities (Jc<50 A cm-2). The result of the measurements are in agreement with Mulet and coworkers, who have predicted that, under certain conditions, the self-field effects on transport measurements are negligible and the Jc dependence on the sample dimensions is determined by the percolative character of the transport current. Self-field influences have also been observed in current-voltage characteristics, which have been analysed using the Ambegaokar-Halperin phase-slip theory. By allowing the noise parameter () to change with temperature, magnetic field and transport current, adequate agreement between theoretical and experimental current-voltage characteristics has been obtained. The dependence of the noise parameter with the transport current is demonstrated to be related with the self-field.

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Section: Methodsmentioning

confidence: 99%