Observation of long localization length along b-axis PrBa2Cu3O7 in a-axis YBa2Cu3O7/a, b-axis PrBa2Cu3O7 superlattices

✍ Scribed by Y. Suzuki; J.M. Triscone; C.B. Eom; M.R. Beasley; T.H. Geballe

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 230 KB
• Volume: 235-240
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(94)91954-2

✦ Synopsis

We have studied resistive transitions of a-axis YBa2Cu307/a, b-axis PrBa2Cu307 superlattices in a magnetic field to investigate the correlation length of vortices along the a-axis direction of YBa2Cu307 across an a, b-axis oriented PrBa2Cu30 7 barrier. The correlation of vortices across up to 480/~. of a, b-axis PrBa2Cu307 is evidence consistent with long proximity coupling coherence lengths in PrBa2Cu307 found in sandwich type YBa2Cu307 PrBa2Cu307/YBa2Cu307 Josephson junctions. Investigation of a-b plane and b-axis transport of undoped and cobalt doped PrBa2Cu307 films suggests that a long localization length along the b-axis of PrBa2Cu307 is the origin of this long range proximity coupling, consistent with our vortex coupling experiments and recent theoretical and experimental work based on the electronic structure of PrBa2Cu307.