  We construct a new class of black brane solutions in Einstein-Maxwell-dilaton
(EMD) theory, which is characterized by two parameters $a,b$. Based on the
obtained solutions, we make detailed analysis on the ground state in zero
temperature limit and find that for many cases it exhibits the behavior of
vanishing entropy density. We also find that the linear-T resistivity can be
realized in a large region of temperature for the specific case of $a^2=1/3$,
which is the Gubser-Rocha model dual to a ground state with vanishing entropy
density. Moreover, for $a=1$ we analytically construct the black brane which is
magnetically charged by virtue of the electric-magnetic (EM) duality. Various
transport coefficients are calculated and their temperature dependence are
obtained in the high temperature region.
