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Critical Current Density and Microstructure of NdBa_2Cu_3O_7 Single Crystal

100%
Diko P., Zmorayová K., Šefčiková M., Antal V., Kováč J., Yao X.
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issue 5
1028-1030
EN
The top-seeded solution growth method was used to grow NdBCOss single crystals in air. The microstructure of the samples has shown that the oxygenation crack structure developed in the single crystals. The intrinsic critical current density was estimated to be at least twice higher than the value of volume critical current density determined from the magnetization measurements.
2
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Growth Rate of YBa_2Cu_3O_7 Bulk Crystals in Y_{1.5}Ba_2Cu_3 System with CeO_2 Addition

100%
Zmorayová K., Šefčiková M., Volochová D., Kalmanová M., Piovarči S., Diko P.
Acta Physica Polonica A
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2012
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vol. 122
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issue 4
725-727
EN
The growth rate of Y_1Ba_2Cu_3O_{x} bulk single grain (in fact single crystal) superconductors in the system with composition Y_{1.5}Ba_2Cu_3O_{x} and CeO_2 addition was studied in the temperature range 991-1001°C. It is shown that the growth rate of bulk crystal is different for a- and c-growth direction. Slower measured growth rate in studied system than in pure Y_1Ba_2Cu_3O_{x} is related to the composition shift to the three-phase field containing CuO.
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Time Dependent Changes in Ag Doped YBCO Superconductors

84%
Volochová D., Antal V., Diko P., Šefčiková M., Zmorayová K., Kováč J., Weber H., Chaud X.
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issue 5
1047-1048
EN
Magnetization measurements at 77 K were conducted on the single-crystalline samples of YBCO superconductor doped with Ag prepared by the top-seeded melt-growth process. The single-grain samples had a nominal composition Y_{1.5}Ba_2(Cu,Ag)_3O_{y}. Magnetization measurements on the samples, oxygenated by two different processes: by standard oxygenation and by high pressure oxygenation, repeated after 24 months, revealed time dependent changes in magnetization behaviour and critical transition temperatures, T_{c}, which could be associated with redistribution of oxygen vacancies and their interaction with Ag dopant atoms.
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