Optical probing of anisotropic heat transport in the quantum spin ladder Ca 9La 5Cu 24O 41
Fishman, D. A.
Haan, F. De
Loosdrecht, P. H. M. Van
SourceInternational Journal of Heat and Mass Transfer
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A transient thermal imaging technique is used to monitor heat diffusion at the surface of the antiferromagnetic spin ladder material Ca 9La 5Cu 24O 41. 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. © 2012 Elsevier Ltd. All rights reserved.