Magnetic properties of YBCO single-crystal grown on Y 2O 3 layer by a cold top-seeding method
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Author list: Aydiner A., Çakir B., Başoǧlu M., Seki H., Wongsatanawarid A., Murakami M., Yanmaz E.
Publisher: Springer
Publication year: 2012
Journal: Journal of Superconductivity and Novel Magnetism (1557-1939)
Volume number: 25
Issue number: 2
Start page: 391
End page: 397
Number of pages: 7
ISSN: 1557-1939
eISSN: 1557-1947
Languages: English-Great Britain (EN-GB)
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Abstract
In this work, single-crystal samples 20 mm in diameter were grown by a cold top-seeding method. In order to study the effect of an Y 2O 3 buffer layer, a compacted precursor was located in a crucible on a buffer layer of freely poured Y 2O 3 powder. The YBCO bulk samples were carefully prepared in the same chemical composition. In order to examine the homogeneity of the samples, rectangular specimens were cut from a sample. The structural orientation of the specimens was measured by a X-ray diffractrometer (XRD). The microstructure was observed with a Scanning Electron Microscope (SEM). The magnetic properties were measured using a Vibrating Sample Magnetometer (VSM) at 77 K with the applied magnetic field parallel to the c-axis. As a result only (00l) peaks were observed in X-ray diffraction data, indicating that all specimens are highly oriented with the c-axis perpendicular to the top surface. Also the cut samples exhibited very fine Y211 inclusion distributed in the bulk sample observed in SEM micrographs. The critical current density J c (A/cm 2) has been estimated by the extended Bean model. The maximum value of the critical current density at 77 K is 5.2ื10 4 A/cm 2 in a self-field. The trapped magnetic fieldmeasurements of the samples were performed by using Hall probe scanning device with static field of 0.5 T at 77 K. The single-domain sample exhibits a trapped field of 1140 G at 77 K. ฉ Springer Science+Business Media, LLC 2011.
Keywords
Critical current density, Trapped magnetic field, Y2O3 buffer layer, YBCO single crystal
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