Relationship between growth, structure and superconductivity of single crystal YBa2Cu3O7-delta

Citation
C. Chen et al., Relationship between growth, structure and superconductivity of single crystal YBa2Cu3O7-delta, J L TEMP PH, 117(3-4), 1999, pp. 711-715
Citations number
8
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF LOW TEMPERATURE PHYSICS
ISSN journal
00222291 → ACNP
Volume
117
Issue
3-4
Year of publication
1999
Pages
711 - 715
Database
ISI
SICI code
0022-2291(199911)117:3-4<711:RBGSAS>2.0.ZU;2-3
Abstract
We study the crystal growth of YBa2Cu3O7-delta with additives, using ac sus ceptibility, X-ray diffraction and STM. One specific additive, BaF2, dramat ically improves both the crystal growth and the superconducting properties. A cluster growth model is proposed to describe the function of the additiv e. F- reduces the Al contamination of Cu-O chains, and the orthorhombicity increases. On a nanometer scale, the roughness of the chains decreases mark edly. Superconductivity is further enhanced using noncontaminating crucible s. Large single crystals with T-C = 93.7 K and Delta T-C = 0.1 K were grown in Y2O3 or BaZrO3 crucibles using the BaF2 additive.