Author/Authors :
M. Otter، نويسنده , , G. Athanasopoulos، نويسنده , , N. Hlubek، نويسنده , , M. Montagnese، نويسنده , , M. Labois، نويسنده , , D.A. Fishman، نويسنده , , Edward H. F. de Haan، نويسنده , , S. Singh، نويسنده , , D. Lakehal and F. Thiele، نويسنده , , J. Giapintzakis، نويسنده , , C. Hess، نويسنده , , G. Dhalenne and A. Revcolevschi ، نويسنده , , P.H.M. van Loosdrecht، نويسنده ,
Abstract :
A transient thermal imaging technique is used to monitor heat diffusion at the surface of the antiferromagnetic spin ladder material Ca9La5Cu24O41. This material shows highly anisotropic thermal conductivity due to a large uni-directional magnetic heat transport along the ladders. The thermal conductivity is measured using optical heating as well as electrical heating, yielding 37 ± 3 W m−1 K−1 for the fast (ladder) direction and 2.5 ± 0.5 W m−1 K−1 for the slow direction, respectively. The fast direction result is in agreement with the thermal conductivity measured using other dynamic methods, but about 60% lower than the thermal conductivity measured using steady state methods.
Keywords :
Spin ladder , Thermal imaging , Magnetic excitations , Anisotropic heat diffusion , Quantum spin systems
