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Anomalously low levels of proximity effect (PE) coupling, as well as an anomalously high paramagnetic tilt, have been found in some of the superconducting multifilamentary strands produced for the Versailles Project on Advanced Materials and Standards (VAMAS). We report on two types of strands that were measured for the 2nd VAMAS intercomparison program on low-frequency (hysteretic) AC loss: (i)...
In order to clarify the mechanism concerning the enhancement of critical current density (J c ) due to artificial pinning centres (APC), nanometer scale Nb/Cu multilayer composites have been prepared from Nb and Cu foils by the jelly-roll process. The layer thickness of the specimen was chosen using a calculation based on the phenomenological Ginzburg-Landau theory. The microstructure of...
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