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Träfflista för sökning "WFRF:(Han J) srt2:(1992-1994)"

Sökning: WFRF:(Han J) > (1992-1994)

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1.
  • MAGNUSSON, J, et al. (författare)
  • FLUX PINNING IN YBA2CU3O7 THIN-FILMS GROWN BY DC MAGNETRON SPUTTERING
  • 1992
  • Ingår i: Cryogenics (Guildford). - : Elsevier BV. - 0011-2275 .- 1879-2235. ; 32, s. 1084-1088
  • Tidskriftsartikel (refereegranskat)abstract
    • Thin films of YBa2Cu3O7 (YBCO) were deposited on single crystalline LaAlO3 substrates using d.c. magnetron sputtering. The quality of the films has been assessed by X-ray diffraction; YBa2Cu3O7 grows epitaxially with the c-axis parallel to the substrate normal. For some choices of the deposition parameters in the sputtering process, it was found that secondary phases were precipitated in the films. By a deliberate choice of deposition parameters, semi-coherently grown Y2O3 (yttria) inclusions could be obtained. They had square platelet or cubical shapes with sizes from 5 - 20 nm and thickness approximately 10 nm. The superconducting properties of the YBa2Cu3O7 films were investigated using SQUID magnetometry. Magnetization measurements on films with different densities of semicoherent Y2O3 inclusions indicate an enhanced flux pinning capability with increasing inclusion density.
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2.
  • Selinder, T.I., et al. (författare)
  • Yttrium oxide inclusions in YBa2Cu3Ox thin films : Enhanced flux pinning and relation to copper oxide surface particles
  • 1992
  • Ingår i: Physica C: Superconductivity and its Applications. - 0921-4534. ; 202:1-2, s. 69-74
  • Tidskriftsartikel (refereegranskat)abstract
    • Semi-coherent Y2O3 (yttria) inclusions are identified in high quality epitaxial YBa2Cu3Ox (YBCO) thin films by using transmission electron microscopy and energy dispersive X-ray analyses. Magnetization measurements show enhanced flux pinning in films containing an increasing number density of inclusions. The inclusions are incorporated into the films without disturbing the YBCO structure appreciably. The number density is ≈ 1017 cm-3 in films having transport critical currents of 4x106 A cm-2 at 77 K. Nucleation of the yttria inclusions is suggested to occur spontaneously during film growth. The abundance of yttria inclusions is connected to the occurrence of large Cu-rich surface particles in films that have optimum superconducting properties.
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refereegranskat (2)
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Han, Z. (2)
Helmersson, Ulf (1)
Wallenberg, LR (1)
Svedlindh, P (1)
Helmersson, U (1)
Nordblad, P (1)
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Sjöström, H (1)
LUNDGREN, L (1)
Sundgren, J. E. (1)
Magnusson, J (1)
Norling, P. (1)
Selinder, T. I. (1)
SELINDER, TI (1)
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Uppsala universitet (1)
Lunds universitet (1)
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1992 (2)

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