Preparation dependent superconductivity in TlCaBa2Cu3O7.5±d
above 100 K |
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| Authors: | I Kirschner I Halász T Träger J Tóth Gy Kovács T Porjesz G Zsolt T Kármán |
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| Institution: | (1) Department for Low Temperature Physics, Roland Eötvös University, Puskun u. 5-7, H-1088 Budapest, Hungary;(2) Central Research Institute for Chemistry, Pusztaszeri ut 59/67, H-1025 Budapest, Hungary;(3) Central Research and Design Institute for Silicate Industry, Bécsi ut 126/128, H-1034 Budapest, Hungary;(4) Central Research Institute for Physics, Konkoly Thege ut 29-33, H-1121 Budapest, Hungary |
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| Abstract: | Different heat treatment procedures were applied during sample preparation, which resulted in different superconducting properties in samples of the same nominal composition, TlCaBa2Cu3O7.5±d
. This manifests itself in different critical temperatures: 104 K, 107 K and 93 K. The highestT
c belongs to the best-crystallized samples in which the tetragonal Tl2Ca1Ba2Cu2O8±d
phase is responsible for the superconductivity. The effect of heat treatments is reflected in the structural and magnetic properties as well. |
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