HTSC Josephson junctions and dc SQUIDs on SrTiO3 bicrystal substrates grown by floating zone methodстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:A new approach to the fabrication of a SrTiO3 bicrystal substrates, based on floating zone growth of natural SrTiO3 bicrystals with misorientation angles 24° and 37°, has been developed. Thin film YBCO Josephson junctions and dc SQUIDs on SrTiO3 bicrystal substrates were fabricated and studied at T=77 K. The critical current density jc and IcR n product for the junctions with misorientation angle α=24° were close to 2×104 A/cm2 and 190-260 μV, respectively, while for α=37° it was found that jc≈2×103 A/cm2 and IcRn≈90-120 μV. The dc SQUIDs were made with typical inductances 20-80 pH, critical currents of 20-150 μA and resulting voltage modulation 10-40 μV. Noise measurements performed at 77 K revealed low 1/f noise with cut-off frequency about 10 Hz