We report the temperature and magnetic field dependences of critical current densities J c (H-, T) and the irreversibility lines H irr (T) for Hg 1-x Tl x Ba 2 (Ca 0.86 Sr 0.14 ) 2 Cu 3 O 8+delta; (x = 0.0, 0.25, 0.50 and 0.75). The partial substitution of Tl for Hg leads to significant enhancement of J c -and H irr without changing T c . This enhancement is attributed to an improvement in the flux pinning capability by the Tl doping. The temperature dependence of J c and H irr follows a power law: J c ∝ (1 - T/T c ) v and H irr ∝ (1 - T/T c ) α with the values of v and α decreasing as the Tl content increases.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Materials Chemistry