Abstract
The recent discovery1 of ceramic superconductors with high transition temperatures opens the way for the development of superconducting devices operating at liquid-nitrogen temperature (77 K). Of particular interest is the possibility of constructing a radio-frequency superconducting quantum interference device (r.f. SQUID), for use as an extremely sensitive magnetometer2. The operation of the r.f. SQUID is also of interest as a means of investigating superconductivity in the new ceramic materials. Here we report the construction of an r.f. SQUID based on the multi-phase high-temperature superconducting ceramic Y1.2Ba0.8CuO4 (ref. 1). We have used this as a magnetometer operating at 4.2 K and have observed unusual SQUID behaviour which may be due to the presence of many weakly coupled superconducting paths within the material1,3. We have also observed SQUID behaviour at temperatures as high as 45 K.
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References
1. Wu, M. K. et al. Phys. Rev. Lett. 58, 908–910 (1987). 2. van Duzer, T. & Turner, C. W. Principles of Superconducting Devices and Circuits (Elsevier, New York, 1981). 3. Muller, K. A., Takashige, M. & Bednorz, J. G. Phys. Rev. Lett. 58, 1143–1145 (1987). 4. Williamson, S. J. & Kaufman, C. / Magnetism magn. Mater. 22, 129 (1981). 5. Gough, C. E. et al. Nature 326, 855 (1987).
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Colclough, M., Gough, C., Keene, M. et al. Radio-frequency SQUID operation using a ceramic high-temperature superconductor. Nature 328, 47–48 (1987). https://doi.org/10.1038/328047a0
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DOI: https://doi.org/10.1038/328047a0
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