Abstract： Heat conductivity is studied by direct numerical simulations in a two-dimensional model with chiral Dzyaloshinskii--Moriya (DM) spin superexchange interactions for various DM strengths and finite sizes. We find that when temperature is not too low, the thermal conductivity can be well described in the semi classical spin wave picture, and connections of thermal conductivity with the specific heat and the dynamic relaxation time are verified to be suitable. In particular, the transition arising in Sr14-xCaxCu24O41 is related to a magnetic spin glass and qualitatively understood as a kind of Kosterlitz--Thouless transitions. It is shown that the critical temperature is linearly dependent on the spin--spin interactions for the relevant strong DM strength.
LIU Hui-Ping;SUN Yun-Zhou;YI Lin. Heat Conductivity in a Two-Dimensional Finite-Size Spin System with Dzyaloshinskii--Moriya Interactions[J]. 中国物理快报, 2006, 23(7): 1713-1715.
LIU Hui-Ping, SUN Yun-Zhou, YI Lin. Heat Conductivity in a Two-Dimensional Finite-Size Spin System with Dzyaloshinskii--Moriya Interactions. Chin. Phys. Lett., 2006, 23(7): 1713-1715.
2006, Vol. 23 
