Journal
PHYSICAL REVIEW B
Volume 71, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.71.020501
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We report data on the thermal conductivity kappa(T,H) in the basal plane of hexagonal single crystalline and superconducting Mg(B1-xCx)(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 MgB2, the Wiedemann-Franz law is valid for Mg(B0.94C0.06)(2) at low temperatures.
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