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Slovak Academy of Sciences
Institute of Electrical Engineering
Technology and testing of superconducting materials, tapes and conductors for electronic and power engineering applications – SQUIDs, magnets, cables, transformers.
Institute of Experimental Physics, Košice
Technology and properties of bulk REBCO superconducting materials. Description : At this time there is no webpage encompassing superconductivity-related activities at the Institute (except of the Centre of Low Temperature Physics, see below). Therefore, the following brief description is provided here: The Group of ceramic superconductors at the IEP SAS Košice is active in preparation and characterization of bulk REBCO single-grain superconductors. Earlier studies were devoted mainly to characterization of crystal defects and description of mechanisms of their formation. Information about the inhomogeneity of 211 particle concentration in the 123 crystal, formation of subgrain structure, shape change of the sample during solidification, new inert particles in the 123/211 system, modes of growth, sources of mechanical stresses and cracking were obtained between years 1995-2005 and contributed essentially to the general understanding of microstructure formation in the REBCO bulk TSMG superconductors, enabled interpretation of their superconducting properties and became the base for optimization of their properties.
Nowadays, our activity is focused mainly on:
- Formation of effective pinning centers homogeneously distributed in the 123 crystal. In this program we study the influence of chosen alloying elements on the pushing of 211 particles by the crystallization front, formation of new nonsuperconducting neutral nanoparticles suitable for effective pinning, optimization of YBCO crystal growth with additives.
- Control of crack formation during oxygenation of the 123 single-crystalline composite, including the analytical description of stress development during oxygenation, description of oxygenation mechanism associated with cracking, optimization of oxygenation parameters to achieve requested crack pattern (structure) and modification of the sample geometry in respect to oxygenation process.
- Influence of joining parameters on the quality of joints. Mainly the influence of mutual orientation of joined crystals, their microstructure, applied joining solder and temperature parameters of joining on the microstructure and superconducting properties of the joint are investigated.
The group has been engaged in a broad international cooperation with the laboratories participating in the EU projects SCENET, EFFORT and NESPA ( ATI Vienna, IPHT Jena, IEW Dresden, IRC in Superconductivity Cambridge, ICMAB Barcelona and CRETA Grenoble).
Institute of Experimental Physics, Košice Centre of Low Temperature Physics
Fundamental research at ultra low temperatures and high magnetic fields of superfluid helium-3, strongly correlated electron systems and novel superconductors