AC susceptibility in deoxygenated YBCO single crystals
A.J.Moreno, V. Bekeris (Laboratorio de Bajas, Temperaturas,Universidad de Buenos Aires)
TL;DR
This study investigates how deoxygenation affects the magnetic response of YBCO single crystals by measuring their AC susceptibility harmonics under various conditions, revealing changes in pinning and barrier effects.
Contribution
It provides new insights into the impact of oxygen content on the magnetic properties and vortex dynamics in YBCO superconductors.
Findings
Deoxygenation reduces bulk pinning strength.
Deoxygenation enhances geometrical barrier effects.
AC susceptibility varies with oxygen content and external fields.
Abstract
We measured the first and third harmonic of the complex AC susceptibility in YBCO single crystals with different oxygen content. The amplitude of the AC field was varied in presence of an external DC field both applied parallel to the c axis of the crystals. We show evidence that deoxygenation leads to a reduction of bulk pinning strength and consequently to a stronger contribution of geometrical barriers.
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