Fabrication of double-sided Tl2Ba2CaCu2O8 thin films on 2-in. LaAlO3 substrates by pulsed laser deposition and post-annealing

✍ Scribed by S.L. Li; Y.F. Chen; X.P. Xu; R.L. Wang; H.Y. Tian; D.H. Lin; D.N. Zheng

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 274 KB
• Volume: 460-462
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2007.04.031

✦ Synopsis

Double-sided Tl 2 Ba 2 CaCu 2 O 8 (Tl-2212) thin films have been prepared on 2-in. LaAlO 3 substrates by a two-step method in which Tlfree amorphous Ba 2 CaCu 2 O x precursor films were first deposited on the substrates by pulsed laser deposition and the subsequent thallination, crystallization and oriented growth of the superconducting Tl-2212 films were obtained in a long-duration annealing process in argon atmosphere at temperature around 720-740 °C. The films were characterized by means of X-ray diffraction, scanning electron microscopy and transport measurements. The results show that the as-prepared films are predominately single phase with c-axis perpendicular to the substrate surface, except for the presence of some submicron particles on the film surface. For the both sides of the films, the zero-resistance transition temperature T C0 is about 105 K and the critical current density J C is in excess of 10 6 A/cm 2 . The microwave surface resistance R S is below 0.5 mX.