Thermoelectric power of MgB${}_{2-x}$Be${}_x$

Abstract

We investigated thermoelectric power $S(T)$ of MgB${}_{2-x}$Be${}_x$ ($x=0$, 0.2, 0.3, 0.4, and 0.6). $S(T)$ decreases systematically with $x$, suggesting that the hole density increases. Our band calculation shows that the increase occurs in the $\sigma$-band. With the hole-doping, $T_c$ decreases. Implication of this phenomenon is discussed within the BCS framework. While the Mott formula explains only the linear part of $S(T)$ at low temperature, incorporation of electron-phonon interaction enables us to explain $S(T)$ over wide temperature range including the anomalous behavior at high temperature.

4 pages, 4 figures

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• Phase formation and superconductivity of Fe-tube encapsulated and vacuum annealed MgB2
• Band filling and disorder effects on the normal state thermoelectric behavior in MgB2