Magnon Heat Conductivity and Mean Free Paths in Two-Leg Spin Ladders: A Model-Independent Determination

C. Hess, P. Ribeiro, B. Büchner +4

The magnon thermal conductivity ${\kappa }_{\mathrm{mag}}$ of the spin ladders in $\mathrm{S}{\mathrm{r}}_{14}\mathrm{C}{\mathrm{u}}_{24-\mathrm{x}}\mathrm{Z}{\mathrm{n}}_{\mathrm{x}}{\mathrm{O}}_{41}$ has been investigated at low doping levels $x=0$, 0.125, 0.25, 0.5 and 0.…