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Tl/sub 2/Ba/sub 2/CaCu/sub 2/O/sub 8/ films: Growth and applications in dc SQUIDs and microwave devices

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11 Author(s)
Chen, Y.F. ; Chalmers Univ. of Technol., Goteborg, Sweden ; Ivanov, Z.G. ; Johansson, L.-G. ; Kojouharov, R.I.
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Tl-2212 thin films were grown ex situ in a two step process on a variety of substrates, including ones with artificially introduced high angle steps. Grain boundary weak links were formed on LaAlO/sub 3/ substrates with steps and on bicrystal substrates and were employed in dc SQUIDs. The white noise level of the SQUIDs was 50/spl mu//spl Phi//sub 0///spl radic/(Hz) at 77 K. A 12.5 GHz HEMT oscillator stabilized with a Tl-2212 resonator gave 8-10 dB lower phase noise than using a gold resonator.

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Applied Superconductivity, IEEE Transactions on  (Volume:7 ,  Issue: 2 )