  We present a detailed analysis of the structure dependence of the lattice
thermal conductivity of SrTiO3. We have used both ab initio Molecular Dynamic
simulations and Density Functional Theory calculations to decouple the effect
of different structural distortions on the thermal conductivity. We have
identified two main mechanisms for tuning the thermal conductivity when a
distortion is applied. First, the modification of the acoustic-modes energy
dispersion when a change in the lattice parameters is imposed and second, the
low energy polar modes. In particular and counterintuitively, we have found
that an increase in the angle of the oxygen octahedral rotations increases the
thermal conductivity due to its coupling to these polar modes.
