A study of transition metal implanted single crystal YBa2 Cu3 O7-δ
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Date
1994-02-10
Journal Title
Journal ISSN
Volume Title
Publisher
Australian and New Zealand Institutes of Physics
Abstract
The modification of materials by ion-implantation is a method by which the structure and properties of a material can be altered in a controlled fashion and the study of these modified structures can lead to a better understanding of the parent material. The application to the Held of high temperature superconductors has been present ever since the discovery of the new oxides. In this study, high quality single crystal YBa2 Cu3 O7-δ was implanted separately with several different transition metal ions. The implantation was carried out using a metal vacuum vapour arc (MEVVA) ion source operated at 30kV with an approximate dose of ixlO17 ions/cm2 being applied. The resulting crystals were subsequently annealed in two separate anneal cycles in an oxygen atmosphere at 55O°C for a total of 108 hours. The sample analysis techniques involved the use of Rutherford backscattering spectroscopy (RBS), at both 2 and 3.07MeV, a.c. susceptibility measurements, X-ray
diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) for compositional, superconductivity, crystal structure and bonding analysis respectively. This paper will report on the results of this study which have shown that the implantation of nickel increased the rate of oxygenation in the near surface region, obtaining a
transition temperature of 92°K after only 108 hours anneal time, whereas the implantation of iron was deleterious with a transition temperature of only 78°K reached after the same anneal cycles.
Description
Keywords
Annealing, Barium oxides, Copper oxides, Crystal structure, Ion implantation, Magnetic susceptibility, Monocrystals, Ions, Rutherford backscattering spectroscopy, Structural chemical analysis, Transition temperature, Temperature range 0065-0273 K
Citation
Martin, J. W., Russell, G. J., Cohen, D. D., Evans, J., & Hartmann, A. (1994). A study of transition metal implanted single crystal YBa2 Cu3 O7-δ. Paper presented to the 18th Annual Condensed Matter Physics Meeting, Charles Sturt University, Wagga Wagga, NSW, 9-11 February 1994.