Abstract
By considering some columnar parts in the superconducting grains, we explain some characteristic features in the angular dependence of the critical currents of Nb3Sn tapes, prepared in the presence of additional impurities in the reaction atmosphere of the vapour deposition process. Mainly, the decrease of the critical current in magnetic fields nearly parallel to the tape surface (which appears in the form of a “valley” in the polar diagram of the critical current) can be explained by these considerations. By comparing the theoretical and experimental results, including structural investigations, the most probable shape of the grains is suggested.
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