Vol. 2, Issue 2, Part A (2020)

Abstract: This paper deals with the transport properties of high temperature superconductors. The transport properties are temperature dependence of thermal conductivity of high T_c superconductor. We have taken two different high T_c superconductors in our studies namely La_2-nSr_nCuO₄ and YBa₂Cu₃O_7-δ. These superconductors bear transition temperature from 38K to 110K. Transport properties basically concerns with the movement of the classic carriers in the solid. In the case of superconductors the carriers are super electrons which move in the vicinity of a different excitation of the solid created by the impurity which has been dropped in the system. It was believed that as in the case of noble metal or low T_c superconductors (T_c from 1K to 24K) phonons has dominant role in different transport properties. From the investigation this has been ruled out. Phonons does play role in the high T_c superconductor only above T_c. The studies of thermal conductivities of high T_c superconductors indicate that the phonons contributions are larger near T_c and smaller far away.