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 valenc e. In this report, the substitution of thallium for mercury has been s tudied. A series of superconducting. Hg1-xTlxBa2Can-1CunO2n+2+d (with n = 1, 2, 3 and 0 less than or equal to x less than or equal to 1) has been synthesized in sealed tubes. The characterization of these sampl es was made by using X-rays diffraction, SEM, and electrical resistivi ty and magnetic susceptibility measurements. Our results show that the critical temperature T-c does not significantly vary by changing the ratio of Tl to Hg.