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Rectification effect in thin-film superconductors in small, oscillatory magnetic fields

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We have observed the generation of dc voltages across super conducting films of lead and tin due to the presence of a static magnetic fieldH 0 upon which a small, oscillatory magnetic field component is superimposed. The voltages are created without an external current passing though the samples. They change sign with a reversal of the static fieldH 0. The voltages are related to superconductivity and seem to be caused by a nonsymmetric penetration into the specimen of the magnetic field variation. During one cycle of the magnetic field oscillation a small fraction of the total flux entering and leaving the sample appears to be “pumped across” the specimen in a preferential direction. The thickness of the films ranged between 0.16 and 2.5 µm. The frequency ω and the amplitudeH 1 of the oscillatory field was varied from 5 to 120 kHz and from 0 to 2 G rms, respectively. The rectified voltage varies between the different samples and depends uponH 0, ω,H 1, and the orientation of the film relative to the magnetic field. It generally shows a sharp peak near the critical magnetic field. Small rectified voltages caused by the oscillatory field were observed far above the nominal, critical magnetic fields of the films. Apparently, these voltages were associated with the film edges and the enhancement of the critical field at the edges.

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Based on work performed under the auspices of the U.S. Atomic Energy Commission.

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Huebener, R.P., Perkins, H.S. Rectification effect in thin-film superconductors in small, oscillatory magnetic fields. J Low Temp Phys 4, 697–707 (1971). https://doi.org/10.1007/BF00628302

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  • Magnetic Field
  • Magnetic Material
  • Sharp Peak
  • Field Component
  • Preferential Direction