Abstract
Periodic microwave absorption-spectra due to quantised flux penetration into intra-crystal Josephson links in Bi 2Sr 2Ca 1Cu 2O y single crystals were observed at external fluxes Φ x =( k± 1 2 )Φ 0, k=0, 1, 2, … using ESR spectrometer. The link-size and the number of quanta penetrating the links are very small, an order of 0.5 – 4 μm 2 and several to a few tens. The periodicity with a half quantum was shown to be due to 0-type Josephson junction links.
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