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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 $x$, suggestingthat the hole density increases. Our band calculation shows that the increaseoccurs in the $\sigma $-band. With the hole-doping, $T_{c}$ decreases.Implication of this phenomenon is discussed within the BCS framework. While theMott formula explains only the linear part of $S(T)$ at low temperature,incorporation of electron-phonon interaction enables us to explain $S(T)$ overwide temperature range including the anomalous behavior at high temperature.Comment: 4 pages, 4 figure

physical review. b, condensed matter

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Thermoelectric power ofMgB2−xBex