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We measured the 1st and 3rd harmonics of the AC magnetic susceptibility as a function of the temperature and the DC magnetic field, on several Nb3Sn samples (single crystal, polycrystalline samples and multifilamentary wires), with different pinning properties. From these measurements, the Bragg phase, the disordered one and the irreversibility line have been identified in the H-T phase diagram of...
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