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Synthesis, X‐ray data, and Hall effect measurements of Li‐doped Tl‐Ba‐Ca‐Cu‐O superconductor
Author(s) -
Kayed T. S.
Publication year - 2003
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.200310118
Subject(s) - tetragonal crystal system , hall effect , superconductivity , doping , analytical chemistry (journal) , condensed matter physics , lithium (medication) , chemistry , electrical resistivity and conductivity , phase (matter) , materials science , physics , medicine , organic chemistry , quantum mechanics , chromatography , endocrinology
Lithium‐doped Tl‐based superconductor was prepared by adding an amount of 0.3 mol.% to the Tl 1.8 Ba 2 Ca 2.2 Cu 3 O 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. (© 2003 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)