2001/09/10 by M. Putti, E. Galleani d’Agliano, Putti, M. +14
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Graphene research and applications #Physics of Superconductivity and Magnetism #Superconductivity (cond-mat.supr-con) #Superconductivity in MgB2 and Alloys #cond-mat.supr-con
paper · pdf · doi:10.48550/arxiv.cond-mat/0109174
17 pages, in print in Studies of High Temperature Superconductors Ed. A.Narlikar, Vol. 38
openalex publication_date 2001/09/10 · arxiv created 2001/09/11 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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.