  A holographic model of a quantum critical theory at a finite but low
temperature, and finite density is studied. The model exhibits non-relativistic
z=2 Schr\"odinger symmetry and is realized by the Anti-de-Sitter-Schwarzschild
black hole in light-cone coordinates. Our approach addresses the electrical
conductivities in the presence or absence of an applied magnetic field and
contains a control parameter that can be associated to quantum tuning via
charge carrier doping or an external field in correlated electron systems. The
Ohmic resistivity, the inverse Hall angle, the Hall coefficient and the
magnetoresistance are shown to be in good agreement with experimental results
of strange metals at very low temperature. The holographic model also predicts
new scaling relations in the presence of a magnetic field.
