Preparation and transport properties of YBa2Cu3Oy films by the liquid phase epitaxial growth

✍ Scribed by Manabu Yoshida; Takao Nakamoto; Tasuku Kitamura; Yasuji Yamada; Izumi Hirabayashi; Yuh Shiohara; Shoji Tanaka; Akihiro Tsuzuki

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 166 KB
• Volume: 235-240
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(94)91400-1

✦ Synopsis

We have succeeded in preparing YBa2Cu3Oy (YBaCuO) films on MgO (100) and NdGaO 3 (1 I0) substrates by the liquid phase epitaxy (LPE) technique. BaO-CuO was used as flux, and the substrates were put into the molten solution at 970-1000 °C for 5-30 rain in an yttria crucible. We obtained c-axis oriented and highly dense YBaCuO films 10-50 ~m in thickness. The surface of the YBaCuO films appears shiny and smooth. From the SEM micrograph and the AFM image of the YBaCuO film surface, the film has a very flat surface in a terrace pattern. The superconducting transition temperature was typically 88 K after annealing in oxygen atmosphere. The critical current density (Jc) was over 5x104 A/cm 2 at 77 K in zero magnetic field by the transport measurement. In addition, the peak effect of Jc was observed at several tesla for B//a-b plane geometry. This peak effect is considered to be caused by stacking faults which act as a field induced pinning center.