Title :
Enhancing the superconducting properties of Y-Ba-Cu-O by CuO2 site doping
Author :
Zhou, Yu.X. ; Lo, Wai ; Tang, Tong B. ; Salama, Kamel
Author_Institution :
Texas Center for Supercond., Houston Univ., TX, USA
fDate :
3/1/2001 12:00:00 AM
Abstract :
The incorporation of certain cations such as Zn2+ onto the ab-planes of the YBa2Cu3O7-δ (123) lattice is known to have effects on the superconducting critical transition temperature. On manipulating the distance between the dopant sites, isolated weak superconducting regions with dimensions comparable to the coherence length of YBCO can be introduced into melt textured large YBCO grains. This paper presents a study using electron microprobe analysis, microscopy and transport property measurements on the processing and the distribution of Zn2+ in Zn-YBCO so as to understand as well as optimize the processing conditions, doping level, Tc, flux pinning behaviour and field trapping properties of these materials. These results were correlated with the solidification mechanisms of YBCO as well as the size of weak superconducting regions induced by Zn2+
Keywords :
barium compounds; coherence length; electron microscopy; electron probe analysis; flux pinning; high-temperature superconductors; melt texturing; solidification; superconducting transition temperature; yttrium compounds; zinc; CuO2 site doping; Tc; Y-Ba-Cu-O; YBa2Cu3O7-δ; YBa2Cu3O7:Zn; Zn2+; ab-plane; cations; coherence length; dopant sites; doping level; electron microprobe analysis; electron microscopy; field trapping; flux pinning; isolated weak superconducting regions; melt textured large YBCO grains; solidification; superconducting critical transition temperature; superconducting properties; transport property; weak superconducting regions; Doping; Electrons; Flux pinning; Superconducting magnets; Superconducting materials; Superconducting transition temperature; Superconductivity; Telephony; Yttrium barium copper oxide; Zinc;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
