Abstract
A radially flowing transport current is fed into a disk specimen suspended in a magnetic field perpendicular to the surface, and the torque resulting from the Lorentz forces is measured. Sample and current leads form a closed superconducting circuit. The current induced in this circuit, and thus the torque, can be increased without dissipation until flux flow starts. The torque corresponding to this limit is directly proportional to the pinning force per unit volume. Results for 0.1-mm-thick Nb samples are reported, including the peak effect and a yield phenomenon. The values of the pinning forces are in good agreement with theoretical predictions and of the same order of magnitude as the measurements of other authors.
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Eggendorfer, G. Direct mechanical measurement of pinning forces on type-II superconductors. J Low Temp Phys 10, 715–733 (1973). https://doi.org/10.1007/BF00655461
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DOI: https://doi.org/10.1007/BF00655461