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We study a class of Schr\"odinger operators $H_{m,\lambda}$ with generalizedThue-Morse potential that generated by the substitution $\tau(a)=a^mb^m$,$\tau(b)=b^ma^m$ on two symbol alphabet $\Sigma=\{a,b\}$ for integer $m\ge 2$and coupling $\lambda>0$. We show that $$\dim_H \sigma(H_{m,\lambda})\ge\frac{\log \Lambda_m}{\log 64m+4},$$ where $\sigma(H_{m,\lambda})$ is thespectrum of $H_{m,\lambda}$, $\Lambda_2=2$, and for $m>2$, $\Lambda_m=m$, if$m\equiv0\mod 4$; $\Lambda_m=m-3$, if $m\equiv1\mod 4$; $\Lambda_m=m-2$, if$m\equiv2\mod 4$; $\Lambda_m=m-1$, if $m\equiv3\mod 4$. This implies that$\dim_H \sigma(H_{m,\lambda})$ tends to $1$ as $m$ tends to infinity.

The Hausdorff dimension of spectrum of a class of gerneralized Thue-Morse Hamiltonians