Physics – Condensed Matter – Superconductivity
Scientific paper
2009-12-03
EPL 90, 27009 (2010)
Physics
Condensed Matter
Superconductivity
16 pages, 3 figures
Scientific paper
We report data on the Hall coefficient (RH) of the carbon substituted Mg(B1-xCx)2 single crystals with x in the range from 0 to 0.1. The temperature dependences of RH obtained for the substituted crystals differ systematically at low temperatures, but all of them converge to the value of 1.8 x 10^-10 m^3/C at room temperature. The RH(T) data together with results of the thermoelectric power and electrical resistivity measurements are interpreted within a quasi-classical transport approach, where the presence of four different conducting sheets is considered. The main influence of the carbon substitution on the transport properties in the normal state is associated with enhanced scattering rates, rather than modified concentration of charge carriers. Presumably the carbon substitution increases the electron-impurity scattering mainly in the pi band.
Karpinski Janusz
Matusiak Marcin
Rogacki Krzysztof
Zhigadlo Nikolai D.
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