Poddar, A and Mandal, P and Das, A N and Ghosh, B and Choudhury, Pranab (1991) Effect of carrier concentration on the normal transport properties and the superconducting transition temperature in the Tl2Ba2Ca1-xYxCu2O8+y system. Physical Review B, 44 (6). pp. 2757-2761. ISSN 1098-0121

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We report measurements of electrical resistivity and Hall voltage on Tl2Ba2Ca(1-x)Y(x)Cu2O8+y samples as a function of temperature for different values of x (0 less-than-or-equal-to x less-than-or-equal-to 0.6). A metal-insulator (M-I) transition is observed in the system at x = 0.48, which corresponds to a hole concentration p of 0.03/Cu-ion. In the insulating samples (x > 0.48) at low temperatures, the conduction is governed by a two-dimensional variable-range-hopping mechanism and a crossover to three-dimensional variable-range hopping occurs as the M-I transition is approached. Superconductivity appears in the vicinity of the M-I transition (p greater-than-or-equal-to 0.03). The T(c) versus p curve is linear in the range (0.03-0.12)/Cu ion. Maximum T(c) (85 K) is observed for p = 0.12/Cu ion.

Item Type: Article
Subjects: Electronics
Depositing User: Bidhan Chaudhuri
Date Deposited: 13 Mar 2015 10:36
Last Modified: 13 Mar 2015 10:54
URI: http://cgcri.csircentral.net/id/eprint/2734

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