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Electromagnetic Properties of Melt-Grown YBaCuO Superconductors Doped by Gd and Sm

100%
Jirsa M., Rameš M., Volochová D., Radušovská M., Diko P.
Acta Physica Polonica A
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2014
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vol. 126
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issue 1
326-327
EN
Electromagnetic properties of YBa_{2}Cu_{3}O_{y} samples melt-grown in air and doped with small amounts of light rare earth (LRE) ions Gd and Sm were studied. The LRE doping creates a point-like disorder contributing to the second peak on the magnetization curve. In the field range of the second peak the average magnetic moment, M_{av}, deduced from the magnetization curves exhibited strong fluctuations. M_{av} is commonly regarded as an equilibrium moment close to the thermodynamic reversible one, obeying in intermediate fields a logarithmic field dependence. However, in our experiments M_{av}(B) curves failed to follow such a dependence below irreversibility line. M_{av}(B) curves deduced from rather static measurements, done by SQUID magnetometer still showed the disturbance but significantly weaker. It indicates that this feature reflects the vortex dynamics in the second peak region. Its scaling with temperature was found to coincide with that of the pinning force.
2
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Changes in YBCO Single Grain Bulk Superconductor Exposed to Air Moisture

100%
Piovarči S., Antal V., Kaňuchová M., Radušovská M., Diko P.
Acta Physica Polonica A
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2014
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vol. 126
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issue 1
364-365
EN
Changes in bulk single grain YBCO superconductor at exposition to air were studied. The increase of the sample weight caused by reaction with air moisture was observed by weighing the samples over two months period. Thermal analyses and mass spectrometry of the exposed samples has shown evolution of water and oxygen during sample heating. Observation with scanning electron microscope confirmed the formation of some nanosize phases at the inner sample surfaces. XPS spectra done on the freshly cleaved and on the air exposed (001) surfaces confirmed changes in Ba and Cu bonds. Observed structural changes did not caused systematic changes in measured trapped field.
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Influence of Sm and Yb Pollution on Superconducting Properties of YBCO Bulk Superconductors

73%
Volochová D., Jurek K., Radušovská M., Piovarči S., Antal V., Kováč J., Jirsa M., Diko P.
Acta Physica Polonica A
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2014
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vol. 126
|
issue 1
358-359
EN
YBa_{2}Cu_{3}O_{7-δ } (YBCO, Y-123) bulk superconductors with a nominal composition Y_{1.5}Ba_{2}Cu_{3}O_{x} and 1 wt% CeO_{2} addition were prepared by the Top Seeded Melt Growth (TSMG) process. Small single-crystalline pieces, cut from the SmBa_{2}Cu_{3}O_{y} (Sm-123) bulk, were used for seeding of epitaxial growth. Wavelength-dispersive spectrometry (WDS) confirmed the presence of 0.1 wt% Sm from the seed and 0.25 wt% Yb from the substrate, practically in the whole sample volume. The influence of this Sm and Yb contamination on superconducting properties of grown bulk materials is reported.
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