Study of higher-order harmonics of complex ac susceptibility in $YB_2C_3O_{7-δ}$ thin films by the mutual inductive method

Details Study of higher-order harmonics of complex ac susceptibility in $YB_2C_3O_{7-δ}$ thin films by the mutual inductive method Study of higher-order harmonics of complex ac susceptibility in $YB_2C_3O_{7-δ}$ thin films by the mutual inductive method

2010-05-24

arxiv.org/abs/1005.4378v1

Physica C, 470 2061-2066 (2010)

Physics

Condensed Matter

Superconductivity

8 pages, 3 figures

Scientific paper

10.1016/j.physc.2010.09.014

We have applied the mutual inductive method to study higher-order harmonics of complex ac susceptibility $\chi_n=\chi'_n-i\chi"_n$ for $$YB_2C_3O_{7-\delta}$ thin films as function of the temperature and the applied field. The experimental results were compared with analytical and numerical results obtained from the Ishida-Mazaki model and the solution of the integral equation for the current density, respectively. Both models allow us to reproduced the main experimental features, however, as $n$ increases the numerical model shows notable discrepancies. This failure can be attributed to the current-voltage characteristics. Also this investigation yields the activation energy $U_c$ and the critical current density $J_c$ for two samples both at T=0.

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