This article is cited in 2 papers

Superconductivity

High-temperature superconductors YBaCu$_2$O$_5$ and Tl$_{1.5}$BaCa$_2$Cu$_{2.5}$O$_8$ with a decreased content of heavy metals (Ba and Tl)

Yu. M. Gerbshtein, E. I. Nikukin

Ioffe Institute, St. Petersburg

Abstract: New high-temperature superconductors YBaCu$_2$O$_5$ и Tl$_{1.5}$BaCa$_2$Cu$_{2.5}$O$_8$ have been synthesized. They can be considered as a result of the removal of barium cuprate BaCuO$_2$ from YBa$_2$Cu$_3$O$_7$ and barium cuprate-tallate BaCu$_{0.5}$Tl$_{0.5}$O$_2$ from Tl$_2$Ba$_2$Ca$_2$Cu$_3$O$_{10}$. The synthesized compounds contain a smaller amount of toxic Ba and Tl. Investigation of electrical conductivity has demonstrated that the values of $T_c$ of synthesized materials are close to $T_c$ of starting materials. The Meissner effect observed for these materials has confirmed their belonging to high-temperature superconductors.

Received: 11.08.2011

 English version: Physics of the Solid State, 2012, 54:3, 459–461

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