Influence of carbon substitution on the heat transport in single crystalline MgB2

Details Influence of carbon substitution on the heat transport in single crystalline MgB2 Influence of carbon substitution on the heat transport in single crystalline MgB2

2004-09-05

arxiv.org/abs/cond-mat/0409110v2

Phys. Rev. B 71, 020501(R) (2005)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures. Final version to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.71.020501

We report data on the thermal conductivity \kappa(T,H) in the basal plane of hexagonal single-crystalline and superconducting Mg(B_{1-x}C_x)_2 (x= 0.03, 0.06) at temperatures between 0.5 and 50 K, and in external magnetic fields H between 0 and 50 kOe. 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 \sigma-band. In contrast to the previously observed anomalous behavior of pure MgB$_2$, the Wiedemann-Franz law is valid for Mg(B_0.94 C_0.06)_2 at low temperatures.

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