Transport properties of ultrathin YBCO films and YBCO/PrBCO superlattices - Matsuda, Y.; Fujiyama, A.; Komiyama, S.; Terashima, T.; Shimura, K.; Bando, Y. (Elsevier)
Resistice transitions in the presence of magnetic field have been studied on ultrathin YBCO films and YBCO/PrBCO superlattices. We found that: i)The lower critical magnetic field in parallel coniguration (Hab) is about 10 tesla for 5 unit cell thickness YBCO film, ii)When field is applied perpendicular to abplane, correlation length along the flux line is about 10 unit cell length.
http://linkinghub.elsevier.com/retrieve/pii/0921-4534(91)91152-T
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