Structural and superconducting properties of single-crystal Bi2Sr2Ca n − 1Cu n O2n + 4 + δ (n = 1–3) whiskers grown in gas-filled cavities

Autor:	V. A. Stepanov, G. A. Kalyuzhnaya, V. V. Rodin, S. G. Chernook, Yu. I. Gorina, M. V. Golubkov, N. N. Sentyurina
Rok vydání:	2009
Předmět:	Inorganic Chemistry Diffraction Superconductivity Crystallography Materials science Annealing (metallurgy) General Chemical Engineering Whiskers Doping Materials Chemistry Metals and Alloys Superconducting transition temperature Single crystal
Zdroj:	Inorganic Materials. 45:671-677
ISSN:	1608-3172 0020-1685
DOI:	10.1134/s0020168509060168
Popis:	Using growth inside gas-filled cavities in KCl-fluxed melts, we have obtained free-standing phasepure Bi2Sr2Can − 1CunO2n + 4 + δ (n = 1–3) whiskers possessing superconducting properties in the as-grown state. Bi-2212 whiskers have been prepared in a wide range of doping levels, from underdoped (Tc = 76.5 K) to optimally doped (Tc = 84 K). The whiskers possess high structural perfection, as shown by X-ray diffraction. Annealing under optimal conditions raises the superconducting transition temperature of the underdoped Bi-2212 whiskers to Tc max = 85.5 K (ΔTc = 1.8 K), without impairing their structural perfection.
Databáze:	OpenAIRE
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