Ultrathin YBa2Cu3O7 films with YBa2Cu2.7Nb0.3O7 buffer layer

✍ Scribed by I. Grekhov; V. Borevich; L. Delimova; I. Liniychuk; A. Lyublinsky

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 108 KB
• Volume: 235-240
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(94)91528-8

✦ Synopsis

A new type of buffer layer, based on Nb doped YBa2Cu307 material, has been used for high quality HTSC ultrathin film fabrication. This new material represents a dielectric continuum of YBa2NbO 6 phase with YBa2Cu307 phase inclusions. The later serve as nuclei while growing ultrathin YBa2Cu307 film on this buffer layer. As an example we have fabricated 6 unit cell YBa2Cu307 film showing transition into a superconducting state with onset temperature 87K ,zero resistance temperature 80K and critical current density jc(77 K) = 2" 105 A/era 2.