The elastic regime of vortices in superconducting YBCO and multilayer YBCO/PrBCO films

✍ Scribed by W.S. Seow; R.A. Doyle; J.D. Johnson; D. Kumar; R. Somekh; D.J.C. Walker; A.M. Campbell

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 916 KB
• Volume: 241
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(94)02350-6

✦ Synopsis

A sensitive AC transport technique is used to determine the force-displacement response in the elastic regime of vortices pinned in YBCO and multilayer YBCO/PrBCO films. The dependences of the elastic limit of displacement and the Labusch parameter are presented as a function of temperature, magnetic-field amplitude and orientation. Results are presented for DC sputtered and laser-ablated epitaxial c-axis YBCO films as well as a DC sputtered multilayer YBCO/PrBCO film with a unit-cell ratio of 4:6. The elastic parameters enable the effective energy of the pinning wells to be determined, and comparisons of these values are made with activation energies extracted from thermally activated flux-flow analyses of magneto-resistance data. The force-displacement values show better agreement with magnetic-relaxation measurements than those from Arrhenius analyses.