Scanning tunneling microscope studies of initial epitaxial growth of YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} thin films

Conference · Wed Apr 01 04:00:00 EST 1992

OSTI ID:10149368

Zheng, Xiang-Yang; Zhu, Shen ^[1]; Lowndes, D H; Warmack, R J ^[2]

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1. Tennessee Univ., Knoxville, TN (United States). Dept. of Physics and Astronomy
2. Oak Ridge National Lab., TN (United States)

The initial stage of epitaxial growth of laser ablated YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} (YBCO) thin films on (001) SrTiO{sub 3}, LaAlO{sub 3}, and MgO substrates, and on slightly miscut LaAlO{sub 3} and SrTiO{sub 3}, have been studied with scanning tunneling microscopy (STM). Surface images show that the initial YBCO growth mode can be either of the Stranski-Krastanov or the Volmer-Weber type, depending on the film-substrate lattice mismatch and the growth temperature. A small substrate miscut angle is found to strongly influence the growth mode of YBCO films. Screw dislocation-mediated growth is suppressed, and films grown at 800{degrees}C on (001) LaAlO{sub 3} substrates with miscut angle of 2.0{degrees} along <100> or <110> directions were found to consist of tilted platelets that are epitaxially aligned with the substrate crystal lattice.

• Research Organization: Oak Ridge National Lab., TN (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 10149368
• Report Number(s): CONF-920402--8; ON: DE92014135
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201
360202
ABLATION
ALUMINIUM OXIDES
BARIUM OXIDES
CRYSTAL DEFECTS
CUPRATES
HIGH-TC SUPERCONDUCTORS
LANTHANUM OXIDES
MAGNESIUM OXIDES
MORPHOLOGY
PREPARATION AND FABRICATION
SCANNING ELECTRON MICROSCOPY
STRONTIUM TITANATES
STRUCTURE AND PHASE STUDIES
SUBSTRATES
SUPERCONDUCTING FILMS
YTTRIUM OXIDES