Structural and Flux-Pinning Properties of Laser Ablated YBa₂Cu₃O_7-δ Thin Films: Effects of Self-Assembled CeO₂ Nanodots and LaAlO₃ Substrates

Journal Article · Tue Jan 01 00:00:00 EST 2008 · Physica C

DOI:https://doi.org/10.1016/j.physc.2008.07.008· OSTI ID:945351

Haywood, Talisha M ^[1]; Oh, Sang Ho ^[1]; Kebede, Abede ^[2]; Pai, Devdas M. ^[2]; Sankar, Jag ^[2]; Christen, David K ^[1]; Pennycook, Stephen J ^[1]; Kumar, Dhananjay ^[1]

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1. ORNL
2. North Carolina A&T State University

Self-assembled nanodots of CeO{sub 2} on (1 0 0) LaAlO{sub 3} substrates, generated in situ by means of a pulsed laser deposition method prior to the deposition of YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} (YBCO) films, have been used to modify the superconducting properties of resulting YBCO films. Structural characterization has indicated that CeO{sub 2} layers grow via van der Merwe three-dimensional mode and the islands eventually acquire a pancake type of structure with lateral dimension several times larger than vertical dimension. The three-dimensional growth of CeO{sub 2} islands with (1 0 0) preferred orientation is believed to be associated with its surface energy anisotropy. The magnetization versus temperature and magnetization versus field measurements and analysis have suggested that CeO{sub 2} can affect the superconducting properties of YBCO films favorably or adversely depending on the density of CeO{sub 2} nanodots on the substrate surfaces prior to the deposition of YBCO films.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 945351
• Journal Information: Physica C, Vol. 468, Issue 23
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
YTTRIUM OXIDES
BARIUM OXIDES
COPPER OXIDES
QUANTUM DOTS
CERIUM OXIDES
SUBSTRATES
LANTHANUM OXIDES
ALUMINIUM OXIDES
SUPERCONDUCTIVITY
DEPOSITION
GRAIN ORIENTATION
MAGNETIC FLUX
MAGNETIZATION
THIN FILMS