Electrical and thermal transport properties of EuBa2(Cu1-xMnx)(3)O7-delta

摘要

In this communication, we present the measurements of electrical resistivity (rho), thermal conductivity (kappa), thermopower (S), and specific heat (C-P) on Mn doped compounds EuBa2(Cu1-xMnx)(3)O7-delta for 0 <= x <= 0.02. The transition temperature T-C and the upper critical field HC2(0) in this series of compounds are found to decrease quasi-linearly as the Mn concentration increases. All the currently investigated samples show a hump in thermal conductivity below their transition temperatures. Thermopower measurements exhibit an electron-like behaviour for pure samples; however, a hole-like behaviour is seen in all the doped samples. A small jump in specific heat is observed in the pure samples. It is seen that replacing 0.5% Cu by Mn has little effect on the transition temperature, but there is a nearly twofold suppression in the CP jump for this sample. These results demonstrate that the impurities are being incorporated as a whole and not as a cluster.