Electrical and thermal transport properties of Dy0.95Pr0.05Ba2(Cu1−x Mx)3O7−δ with (M=Fe, Co, Ni and Zn) bulk superconductors

• All superconducting samples show metallic trend.
• Pure and Pr-doped samples show hump in thermal conductivity below their respective transition temperatures.
• Thermo-power shows that the majority charge carries are holes.
• Expected jump in specific heat is observed for pristine sample.
• The jump in specific heat vanishes with co-doping.

In the present communication, measurements of transition temperature, thermal conductivity, thermoelectric power and specific heat have been carried out on pristine and co-doped samples of Dy0.95Pr0.05Ba2(Cu0.98 M0.02)3O7−δ system [M=Fe, Co, Ni and Zn]. The electrical resistivity results show that all the samples exhibit metallic behavior. The thermal conductivity results illustrate that for pristine sample of DyBa2Cu3O7−δ, the expected pronounced hump in thermal conductivity is seen below the transition temperature. The hump is suppressed with 5% Pr-doping and this is further suppressed with co-doping. The thermoelectric power measurements show that the pristine sample exhibits hole-like behavior and this continues for doped as well co-doped samples. Pristine sample shows the expected jump in specific heat and with Pr-doping a slope change is observed near the transition temperature.