Effect of carrier concentration on the normal transport properties and the superconducting transition temperature in the Tl2Ba2Ca1−xYxCu2O8+y system

A. Poddar; P. Mandal; A. N. Das; B. Ghosh; P. Choudhury

doi:10.1103/PhysRevB.44.2757

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Effect of carrier concentration on the normal transport properties and the superconducting transition temperature in the Tl2Ba2Ca1−xYxCu2O8+y system

A. Poddar, P. Mandal, A. N. Das, B. Ghosh, P. Choudhury

DOI 10.1103/PhysRevB.44.2757 · Physical Review B

T1

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Abstract

We report measurements of electrical resistivity and Hall voltage on Tl2Ba2Ca1−xYxCu2O8+y samples as a function of temperature for different values of x (0≤x≤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≥0.03). The Tc versus p curve is linear in the range (0.03–0.12)/Cu ion. Maximum Tc (85 K) is observed for p=0.12/Cu ion.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Tl2Ba2Ca1-xYxCu2O8+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	85	Pressure not reported	unknown
Tl2Ba2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
TlBa2CaCu2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
TlBa2Ca2Cu3O9 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Tl2Ba2Ca2Cu3O10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown