Abstract

Multilayered cuprates of Tl_0.65Hg_0.35Ba₂Ca_n-1Cu_nO_2n+3-/delta, with n = 1–3 have been synthesized by using solid state reaction method in order to investigate the variation of transition temperature T_c. The temperature dependence of resistivity showed that the T_c 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.

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