Transport properties of MgB2

Details Transport properties of MgB2 Transport properties of MgB2

2001-09-10

arxiv.org/abs/cond-mat/0109174v2

Physics

Condensed Matter

Superconductivity

17 pages, in print in Studies of High Temperature Superconductors Ed. A.Narlikar, Vol. 38

Scientific paper

In this paper we present the resistivity, the Seebeck effect, and the thermal conductivity measurements on a MgB2 sintered sample. Such transport properties highlight the role of the junctions between the grains to a different extent. In particular, the temperature dependence of resistivity may be explained with the assumption that grain boundaries have a resistance, independent of temperature, in series with the resistance of grains. Also the behaviour of the Seebeck effect, as long as the scattering at the grain boundaries is elastic, is not affected at all by granularity. Thus, the thermopower can be a useful tool to provide information on the electronic structure. On the other hand, the grain boundary resistance affects the thermal conductivity strongly, masking the superconducting transition completely.

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