  We study heat conduction in one, two and three dimensional anharmonic
lattices connected to stochastic Langevin heat baths. The inter-atomic
potential of the lattices is double-well type, i.e., $V_{\rm
DW}(x)=k_2x^2/2+k_4 x^4/4$ with $k_2<0$ and $k_4>0$. We observe two different
temperature regimes of transport: a high-temperature regime where asymptotic
length dependence of nonequilibrium steady state heat current is similar to the
well-known Fermi-Pasta-Ulam lattices with an inter-atomic potential, $V_{\rm
FPU}(x)=k_2x^2/2+k_4 x^4/4$ with $k_2,k_4>0$. A low temperature regime where
heat conduction is diffusive normal satisfying Fourier's law. We present our
simulation results at different temperature regimes in all dimensions.
