Rao, Ashok and Das , Anirban and Chakraborty, Tirthankar and Gahtori, Bhaskar and Agarwal, S K and Sarkar, Chandan and Sivakumar, K M and Wu, K K and Kuo, Y K (2008) Electrical and thermal transport properties of EuBa2 (Cu1−xMnx) 3O7−δ. Journal of Physics: Condensed Matter, 20. pp. 1-6.

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Abstract

In this communication, we present the measurements of electrical resistivity (ρ), thermal conductivity (κ), thermopower (S), and specific heat (CP ) on Mn doped compounds EuBa2(Cu1−xMnx )3O7−δ for 0 � x � 0.02. The transition temperature TC and the upper ritical 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.

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