Improvement of superconducting properties by BaTiO3 doping into ErBa2Cu3O7−δ films

✍ Scribed by Y. Shingai; T. Abe; M. Mukaida; R. Kita; Y. Yoshida; A. Ichinose; S. Horii; K. Matsumoto; A. Saito; K. Yamada; N. Mori

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 221 KB
• Volume: 445-448
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2006.05.037

✦ Synopsis

We have improved surface resistance (R S ) properties of ErBa 2 Cu 3 O 7Àd (ErBCO) films by using BaTiO 3 (BTO) doping (BTO + ErBCO). The as-grown BTO + ErBCO films did not have enough carriers. We solve this problem by using O 3 + O 2 as background gas during the growth of BTO + ErBCO films. Then, O 3 + O 2 gas is useful to grow BTO + ErBCO films with superior superconducting properties. The R S of a 2 wt.%BTO + ErBCO film is the lowest in BTO + ErBCO films grown in this study. This value is equal to that of a 1.5 wt.%BZO + ErBCO film. The microstructures of the 2 wt.%BTO + ErBCO film are observed by transmission electron microscopy (TEM). In the image, the BTO + ErBCO films did not have the same nanorods as observed in the BZO + ErBCO films against our expectation. However, precipitates that the BZO + ErBCO films do not have, are observed.