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|Title:||Non-thermally activated noise power spectral density in YBa2Cu3O7-δ thin films|
|Source:||Han, K.-H.,Ong, P.C.,Ong, C.K. (2001-08). Non-thermally activated noise power spectral density in YBa2Cu3O7-δ thin films. Superconductor Science and Technology 14 (8) : 539-542. ScholarBank@NUS Repository. https://doi.org/8/305|
|Abstract:||The low-frequency noise power spectral density (PSD) of highly c-axis oriented YBa2Cu3O7-δ thin-film microbridges is measured in the temperature range 77-300 K. At room temperature, the value of the Hooge parameter, γ, is 1.8 × 10-3, which is in the range of ordinary metal films. In the normal state, the noise PSD shows the generic '1/f noise' behaviour and decreases as the temperature is decreased. The experimental data obtained in the normal state cannot be described reasonably well by Dutta-Horn's thermally activated model. Moreover, in the transition temperature (Tc) region, the noise PSD shows 1/fα behaviour with α > 1 and a noise peak appears. The noise increment in the Tc region can be explained by dimensional crossover in this novel percolation noise effect.|
|Source Title:||Superconductor Science and Technology|
|Appears in Collections:||Staff Publications|
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