Abstract
Multilayered cuprates of Tl0.65Hg0.35Ba2Can-1CunO2n+3-/delta, with n = 1–3 have been synthesized by using solid state reaction method in order to investigate the variation of transition temperature Tc. The temperature dependence of resistivity showed that the Tc depends on n. The c-lattice constants of the observed phases obey, the c-axis rule of c = 3.117n+6.5467 for Tl-O layer structures. With an increase in Cu-O layers, the superconducting transition temperature is determined by electrical resistivity-temperature dependency and rises reaching a maximum value of 121 K at n = 3.
Highlights
Perovskite-related oxides were identified in Tl–Ba–Ca–Cu–O system, which forms the homologous series which are represented by general formula TlBa2Can-1CunO2n+3−δ (n: is the number of consecutive Cu-O layers)
Multilayered cuprates of Tl0.65Hg0.35Ba2Can-1CunO2n+3−δ, with n = 1–3 have been synthesized by using solid state reaction method in order to investigate the variation of transition temperature Tc
We present our studies by the synthesis of the TlBa2Can−1CunO2n+3−δ (n = 1–3) phases by substituting an amount of mercury (Hg) with Thallium that exploits the very good control of the reaction which is achieved with a low O2 pressure and permits the formation of Tl0.65Hg0.35Ba2Can-1CunO2n+3−δ Superconductors
Summary
Perovskite-related oxides were identified in Tl–Ba–Ca–Cu–O system, which forms the homologous series which are represented by general formula TlBa2Can-1CunO2n+3−δ (n: is the number of consecutive Cu-O layers). The crystal structures of first three phases (n = 1, 2 and 3) have primitive tetragonal cells at room temperature. These phases are referred to as Tl:1201, Tl:1212, and Tl:1223, which are formed by the conventional sintering method (Sheng & Hermann, 1988b; Sheng et al, 1988; Ganguli, Subbanna, & Rao, 1988; Morosin, Ginlev, Schirber, & Venturini, 1988). It is difficult to prepare any of these as a complete monophase This is the same as the case of the 1223 phase.
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