Flux Pinning of Y-Ba-Cu-O Films Doped With BaZrO3 Nanoparticles by Multilayer and Single Target Methods (Postprint)
Abstract
The superconducting properties of YBa2Cu3O7-x (YBCO or 123) thin films doped with BaZrO3 (BZO) nanoparticles by multilayer and single-target methods were studied and compared. Thin films of 123 + BZO were processed by pulsed laser deposition on LaAlO3 and SrTiO3 single crystal substrates. Multilayer (BZO 0.6 nm - 1.4 nm /23(sub 15) nm)19 structures were grown by alternating deposition from 123 and BZO targets, and BZO additions of 0-2 Vol% were deposited using (1231(sub 1-x) BZO(sub x)) single-targets. The multilayer and single-target methods of BZO addition caused significant differences of superconducting transition temperatures (Tc) measured by AC susceptibility, and critical current densities (Jc) measured by both magnetic and transport methods as a function of temperature (T), applied magnetic field (H) and angle of H field incidence (theta). Single-target films had almost linear decrease of Tc and self-field Jc with BZO vol% addition, and compared to multilayer films had lower Jc(77 K, H < 4 T) however had improved high-field properties for Jc(77 K, H >4 T). Multilayer films had almost no decrease of Tc and self-field Jc for high BZO additions up to 10 Vol% and very strong peak of Jc(H ||ab in - plane) and constant and high Jc(H, < 0 80 deg.). Single-target BZO-2 Vol% films had slightly enhanced Jc(H ||c - axis), consistent with results by other authors.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 2007
- Accession Number
- ADA562253
Entities
People
- F. J. Baca
- Iman Maartense
- Neal A. Pierce
- Paul N. Barnes
- Timothy A. Campbell
- Timothy J. Haugan
Organizations
- Air Force Research Laboratory