Drastic enhancement of magnon thermal conductivity in the Bose-Einstein condensed state of TlCuCl${}_3$

K. Kudo, M. Yamazaki, T. Kawamata +4

We have measured the thermal conductivity of a TlCuCl${}_3$ single crystal in magnetic fields up to 14 T. It has been found that the temperature dependence of the thermal conductivit…