Synthesis, X-ray data, and Hall effect measurements of Li-doped Tl-Ba-Ca-Cu-O superconductor by T. S. Kayed

Crystal Research and Technology

Cryst. Res. Technol. 38, 946 (2003) - Abstract -

Synthesis, X-ray data, and Hall effect measurements of Li-doped Tl-Ba-Ca-Cu-O superconductor

T. S. Kayed

Department of Electrical and Electronics Engineering, Atilim University, 06836 Ankara, Turkey

Keywords	high temperature superconductors, Hall-effect, doping, Tl-based superconductors
PACS	74.72.Jt, 74.62.Bf, 74.25.Fy
DOI	10.1002/crat.200310118

Lithium-doped Tl-based superconductor was prepared by adding an amount of 0.3 mol.% to the Tl_1.8Ba₂Ca_2.2Cu₃O_x compound. The usual solid-state reaction method has been applied under optimum conditions. The x-ray data of the sample show a tetragonal structure with a high ratio of Tl-2223 superconducting phase. The sample showed a transition at 125 K and the zero resistance was observed at 117 K. Longitudinal (transport) and transverse (Hall) resistivities were measured at different temperatures under different magnetic fields and the data were interpreted. A positive Hall coefficient was observed at normal state and a sign reversal appears at temperatures lower than the critical temperature.

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