Abstract
The critical current density Jc is an important indicator of superconducting materials in practical applications. And the third harmonic voltage method is a simple, efficient and damage-free method for measuring Jc of high-temperature superconducting films. In order to more effectively measure the Jc of high-temperature superconducting REBa2Cu3O7-δ films and improve the signal-to-noise ratio based on the third harmonic voltage method, a double-sided measurement method was hereby proposed. By integrating the electromagnetic shielding effect and the 2-coil measurement system, the Meissner effect was used to reduce the harmonic voltage noise in the pickup coil. Comparing the double-sided measurement system using the new method to the 2-coil measurement system, the signal-to-noise ratio increases by 10 dB to 20 dB in the case of a Jc measured in the frequency range from 100 Hz to 1000 Hz. The bullet points of the method can be listed as:•The noise in the pickup coil is reduced and the signal-to-noise ratio is improved in the frequency range from 100 Hz to 1000 Hz by using the Meissner effect.•The measurement bandwidth is increased, making it possible to conduct low-frequency measurement in the future by the double-sided measurement method.•The method provides an improvement direction for superconducting thin films with a high critical current density in the future.
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