Higher-harmonic susceptibility was investigated for single-crystal YBa2Cu3O7-x thin films located in the ac magnetic field perpendicular to the film plane. We found for the first time that the third-harmonic term of the thin films has nonzero values in the region of ac-susceptibility transition. The nonlinear response against ac magnetic field indicates that the Maxwell-Strongin model is not applicable and there must be some mechanism obstructing the vortex motion in the films.
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Yamamoto et al. (1989) studied this question.
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