The conductivity of superconducting MgB2 was studied in both the superconducting and the normal state region. The latter was almost equally determined by the electronic and the lattice contribution to the total thermal conductivity. In the superconducting state, however, the lattice contribution was larger. The electronic thermal conductivity below TC was deduced from the experimental data by considering the Bardeen-Rickayzen-Tewordt theory; together with the model of Geilikman. The analysis showed that electron scattering on static imperfections predominated.

Thermal Conductivity of Superconducting MgB2. E.Bauer, C.Paul, S.Berger, S.Majumdar, H.Michor, M.Giovannini, A.Saccone, A.Bianconi: Journal of Physics - Condensed Matter, 2001, 13, L487-93