Stabilization of mercury cuprates by thallium, superconductivity in Hg1-xTlxBa2Can-1CunO2n+2+d

An intriguing way to stabilize the Hg-based cuprates is related to the partial substitution of mercury by foreign cations with higher valence. In this report, the substitution of thallium for mercury has been studied. A series of superconducting Hg1-xTlxBa2Can1CunO2n+2+d (with n=1, 2 , 3 and 0≤x≤1) has been synthesized in sealed tubes. The characterization of these samples was made by using X-rays diffraction, SEM, and electrical resistivity and magnetic susceptibility measurements. Our results show that the critical temperature Tc does not significantly vary by changing the ratio of Tl to Hg.