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Pinning and trapped field in MgB2- and MT-YBaCuO bulk superconductors manufactured under pressure

Prikhna, T; Eisterer, M; Chaud, X; Weber, H W; Habisreuther, T; Moshchil, V; Kozyrev, A; Shapovalov, A; Gawalek, W; Wu, M; Litzkendorf, D; Goldacker, W; Sokolovsky, V; Shaternik, V; Rabier, J; Joulain, A; Grechnev, G; Boutko, V; Gusev, A; Shaternik, A; ... mehr

The relevant pinning centers of Abrikosov vortices in MgB$_{2}$–based materials are oxygen-enriched Mg-B-O inclusions or nanolayers and inclusions of MgB$_{x}$ (x>4) phases. The high critical current densities, j$_{c}$, of 10$^{6}$ and 10$^{3}$A/cm$^{2}$ at 1 and 8.5 T, respectively, at 20 K can be achieved in polycrystalline materials (prepared at 2 GPa) containing a large amount of admixed oxygen. Besides, oxygen can be incorporated into the MgB$_{2}$ structure in small amounts (MgB$_{1.5}$O$_{0.5}$), which is supported by Auger studies and calculations of the DOS and the binding energy. The j$_{c}$ of melt textured YBa$_{2}$Cu$_{3}$O$_{7-δ }$ (or Y123)-based superconductors (MT-YBaCuO) depends not only on the perfectness of texture and the amount of oxygen in the Y123 structure, but also on the density of twins and micro-cracks formed during the oxygenation (due to shrinking of the c-lattice parameter). The density of twins and microcracks increases with the reduction of the distance between Y$_{2}$BaCuO$_{5}$ (Y211) inclusions in Y123. At 77 K j$_{c}$=8⋅10$^{4}$ A/cm$^{2}$ in self-field and j$_{c}$=10$^{3}$ A/cm$^{2}$ at 10 Т were found in materials oxygenated at 16 MPa for 3 days with a density of twins of 22–35 per μm (thickness of the lamellae: 45-30 nm) and a density of micro-cracks of 200–280 per mm. ... mehr

Volltext §
DOI: 10.5445/IR/1000068123
DOI: 10.1088/1742-6596/695/1/012001
Zitationen: 1
Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Technische Physik (ITEP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2016
Sprache Englisch
Identifikator ISSN: 1742-6588, 1742-6596
KITopen-ID: 1000068123
HGF-Programm 37.06.02 (POF III, LK 01) New Power Network Technology
Erschienen in Journal of physics / Conference Series
Verlag IOP Publishing
Band 695
Heft 1
Seiten Art. Nr.: 012001
Nachgewiesen in Dimensions
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