TEM observation of ErBa2Cu3O7−δ films with BaZrO3 artificial pinning centers

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

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 419 KB
• Volume: 445-448
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2006.06.012

✦ Synopsis

Microstructure of ErBa 2 Cu 3 O 7Àd films with BaZrO 3 as artificial pinning centers has been studied toward power application of a high temperature superconductor. ErBa 2 Cu 3 O 7Àd films containing 1.5 mass% BaZrO 3 were grown by a pulsed laser deposition method. Microstructure of the ErBa 2 Cu 3 O 7Àd film with BaZrO 3 was investigated by transmission electron microscopy (TEM). In the cross-sectional TEM observation, the nano-rods grew up along near the c-axis of ErBa 2 Cu 3 O 7Àd film were observed. Width of the nano-rods was about 10 nm. We found twins with the averaged width of about 70 nm. The moire ´fringes were also observed. In the EDS mapping analysis, zirconium was not detected clearly from the present TEM specimen. Space of the moire ´fringes is about 1.9 nm. The lattice constant of a material in the ErBa 2 Cu 3 O 7Àd film measured from the space of the moire ´fringes is calculated to be 0.423 nm which coincides with the lattice constant of BaZrO 3 (0.419 nm). Also, the lattice constant measured from the SADP is very close to the value of the BaZrO 3 . It is suggested that BaZrO 3 disperses in ErBa 2 Cu 3 O 7Àd film as the nano-rods.