Dependence of superconducting properties of underdoped Bi-2201 single crystals on the charge composition and growth conditions in gas-filled cavities

Autor: V. V. Rodin, Yu. I. Gorina, N. N. Sentyurina, V. A. Stepanov, G. A. Kalyuzhnaya, S. G. Chernook
Rok vydání: 2008
Předmět:
Zdroj: Journal of Surface Investigation. X-ray, Synchrotron and Neutron Techniques. 2:663-668
ISSN: 1819-7094
1027-4510
DOI: 10.1134/s1027451008040319
Popis: High-quality Bi2 + x Sr2 − y CuO6 + δ (Bi-2201) single crystals with the ratio Bi/Sr = 1.4–2.0 were grown by the free growth method in gas-filled cavities in KCl solution-melt in a range of doping levels, which provides variation in superconducting properties from insulators to optimally doped crystals. The charge composition Bi : Sr : Cu = 1.7 : 2.3 : 2.5 with excess Sr and Cu and synthesis conditions provided growth cavity formation in the KCl solution at the crystal growth stage. Lamellar single crystals and whiskers were grown under quasi-equilibrium conditions of lowered growth temperatures and partial oxygen pressure, achieved in closed gas-filled cavities.
Databáze: OpenAIRE
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