The effects of Cu substitution for Tl in TlSr2Ca2Cu3Oy superconductor were investigated. Nearly single-phase samples of Tl1-xCuxSr2Ca2Cu3 Oy (x = 0.2-0.6) were successfully synthesized using a high pressure technique. The observed shrinkage in the lattice parameter a, concave ρ-T curve above Tc and negative thermoelectric power near room temperature indicated that the Cu-substituted samples were over-doped. Tc for the sample with x = 0.4 increased from 73 to 94 K after annealing treatment in flowing argon gas. The Cu-substituted samples showed lower irreversibility field Birr as a function of reduced temperature than that of the pristine TlSr2Ca2Cu3Oy [Physica C 324 (1999) 15].
- Substitution irreversibility field
- Thermoelectric power
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering