Self-field AC losses of textured Bi2Sr2CaCu2O8+? thin rods

Martinez, E., Hughes, T.J., Diez, C., Angurel, L.A., Yang, Y. and Beduz, C. (1998) Self-field AC losses of textured Bi2Sr2CaCu2O8+? thin rods. Physica C: Superconductivity and its Applications, 310 (1-4), 71-75. (doi:10.1016/S0921-4534(98)00436-5).

Abstract

Self-field AC losses of polycrystalline Bi-2212 thin rods textured by a Laser Floating Zone (LFZ) melting technique have been measured at 77 K. With the optimal processing parameters, these rods, of 1.6–2 mm diameter and 10 cm length, have a transport critical current density of 3 kA/cm2 in the self-field which decreases to about 1.5 kA/cm2 in fields of 0.02 T applied perpendicular to the rod axis. The self-field AC losses have been measured in DC magnetic fields up to 0.03 T. The measurements in zero field show that for a large current range the losses are dominated by hysteresis losses as described by the Critical State Model for a cylinder. For the measurements in DC fields the losses show an increasingly resistive-like dependence with current, while the hysteretic component expected from the CSM becomes less important. Measurements at different frequencies also indicated that the loss per cycle in fields is strongly frequency dependent.

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