2004/09/30 by A. V. Sologubenko, N. D. Zhigadlo, С. М. Казаков +4 · 1 citation
Materials Science · Physics and Astronomy · #Magnesium Alloys: Properties and Applications #Superconductivity in MgB2 and Alloys #Thermal Expansion and Ionic Conductivity #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.71.020501
published as Phys. Rev. B 71, 020501(R) (2005) · 4 pages, 4 figures. Final version to appear in Phys. Rev. B
arxiv created 2004/11/18 · openalex publication_date 2005/01/04 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We report data on the thermal conductivity \ensuremathκ(T,H) in the basal plane of hexagonal single crystalline and superconducting Mg(B_1\ensuremath-xCx)2 (x=0.03,0.06) at temperatures between 0.5 and 50\phantom\rule0.3em0exK, and in external magnetic fields H between 0 and 50\phantom\rule0.3em0exkOe. The substitution of carbon for boron leads to a considerable reduction of the electronic heat transport, while the phonon thermal conductivity seems to be much less sensitive to impurities. The introduction of carbon enhances mostly the intraband scattering in the \ensuremathσ band. In contrast to the previously observed anomalous behavior of pure MgB2, the Wiedemann-Franz law is valid for Mg(B0.94C0.06)2 at low temperatures.