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Optical probing of anisotropic heat transport in the quantum spin ladder Ca9La5Cu24O41

Authors
Journal
International Journal of Heat and Mass Transfer
0017-9310
Publisher
Elsevier
Volume
55
Identifiers
DOI: 10.1016/j.ijheatmasstransfer.2012.01.007
Keywords
  • Magnetic Excitations
  • Quantum Spin Systems
  • Spin Ladder
  • Anisotropic Heat Diffusion
  • Thermal Imaging
Disciplines
  • Physics

Abstract

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±3Wm−1K−1 for the fast (ladder) direction and 2.5±0.5Wm−1K−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.

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