The transport ac loss Q in a superconducting cylinder of radius a with a power-law current-voltage characteristic E=Ec|J/Jc| n as a function of current amplitude Im is numerically calculated for a set of given values of a, Jc, and frequency f at n=5, 10, 20, and 30. After deriving a scaling law and defining a critical frequency fc, the results can be converted and interpolated to those for any values of a, Jc, f, and 5 ≤ n ≤ 30. The "power-law" Q(Im) at f=fc is a better alternative of the critical-state Q(Im), used not only for describing the features of Q(Im,f) of high-temperature superconductors but also for planning Q measurements and their interpretation. © 2005 American Institute of Physics.
|Journal||Applied Physics Letters|
|Publication status||Published - 13 Sep 2005|