Abstract
Measurements of the time decay of non-equilibrium magnetization of various industrialY123-coated conductors have been performed in a dc magnetic field up to 9 T, at temperaturesvarying from 5 to 50 K. In addition, the temperature dependence of the zero-field-cooled(ZFC) magnetization has been studied in order to determine the width of theTc distribution and thus the homogeneity of the superconducting layer.The most stringent condition for applications of superconductors in high fieldNMR magnets is the ability to operate in persistent mode, which requires alow relaxation rate as a function of time for the supercurrent. Relaxationrates of Y123-coated conductors were found to be comparable to those ofNb3Sn at 4.2 K in a wide range of temperatures and magnetic fields. Inparticular, for one of the examined coated conductors, relaxation rates are≤2.2%/decade of the timelog-scale up to T = 50 K and B = 6 T.In this paper it is shown that the width of theTc distribution is strongly influenced by the deposition method of the superconducting layer.It is concluded that the inhomogeneities leading to the broadening of the superconductingtransition are directly responsible for the improvement of the pinning properties.
Published Version
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