Title :
Field-cooled magnetization of YBa/sub 2/Cu/sub 3/O/sub y//PrBa/sub 2/Cu/sub 3/O/sub y/ layered structures
Author :
Obara, H. ; Kosaka, S. ; Eguchi, A. ; Sawa, A. ; Kimura, Y.
Author_Institution :
Electrotech. Lab., Ibaraki, Japan
fDate :
3/1/1993 12:00:00 AM
Abstract :
Using molecular beam epitaxy (MBE) with pure ozone, YBa/sub 2/Cu/sub 3/O/sub y//PrBa/sub 2/Cu/sub 3/O/sub y/ (YBCO/PBCO) layered structures (multilayers) have been fabricated successfully. Differential pumping was used, making a stable rate of evaporation and the effective oxidation of films possible. The films were characterized using X-ray diffraction (XRD) spectra, in situ X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM). Magnetization measurements were used to observe the dynamics of flux in superconductors. The magnetization properties of the layered structure depended on the thickness of YBCO and PBCO layers. The intrinsic properties of the multilayers, such as the coupling effect of YBCO layers, were observed using field-cooled magnetization measurements. The correlation between the two dimensionality and the flux dynamics of these multilayers is discussed.<>
Keywords :
X-ray diffraction examination of materials; X-ray photoelectron spectra; atomic force microscopy; barium compounds; high-temperature superconductors; magnetisation; molecular beam epitaxial growth; praseodymium compounds; remanence; superconducting epitaxial layers; surface structure; yttrium compounds; AFM; MBE; O/sub 3/; X-ray diffraction spectra; XPS; XRD; YBCO-PBCO multilayers; YBa/sub 2/Cu/sub 3/O/sub y/-PrBa/sub 2/Cu/sub 3/O/sub y/ layered structure; atomic force microscopy; coupling effect; differential pumping; effective oxidation; evaporation rate; field-cooled magnetization; flux dynamics; in situ X-ray photoelectron spectroscopy; molecular beam epitaxy; Atomic force microscopy; Magnetic field measurement; Magnetic multilayers; Magnetic properties; Magnetization; Molecular beam epitaxial growth; Oxidation; Superconducting films; X-ray diffraction; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
