Scaling behavior of higher harmonic responses in textured (Bi,Pb)[sub 2]Sr[sub 2]Ca[sub 2]Cu[sub 3]O[sub y]/Ag tapes

Zhang, Y. J.; Ong, C. K.
July 2001
Applied Physics Letters;7/23/2001, Vol. 79 Issue 4
Academic Journal
A silver-sheathed (Bi,Pb)[sub 2]Sr[sub 2]Ca[sub 2]Cu[sub 3]O[sub y] tape was studied in terms of harmonic responses χ[sub n]=χ[sub n][sup ′]-iχ[sub n][sup ″] (n=3, 5, 7) to reveal the angular dependence of its physical properties. In the screening method higher harmonic responses are directly related to the nonlinear voltage–current [E(J)] relation of the sample. Therefore, the effect of the silver sheath on the harmonic measurements can be neglected. We performed measurements of the harmonic responses as a function of applied magnetic field or angle between the magnetic field and the tape plane at various temperatures. The measured data could be scaled onto a single curve by using the three-dimensional scaling relation. The derived anisotropic parameter γ ranged from 5.1 to 5.6 at the measured temperature region. Such a small γ value was attributed to the misalignment of the grains in the tape. © 2001 American Institute of Physics.


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