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

M. Otter, G. Athanasopoulos, N. Hlubek, M. Montagnese, M. Labois, D. A. Fishman, F. de Haan, S. Singh, D. Lakehal, J. Giapintzakis, C. Hess, A. Revcolevschi, P. H. M. van Loosdrecht*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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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 +/- 3W m(-1) K-1 for the fast (ladder) direction and 2.5 +/- 0.5W m 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. (C) 2012 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)2531-2538
Number of pages8
JournalInternational Journal of Heat and Mass Transfer
Volume55
Issue number9-10
DOIs
Publication statusPublished - Apr-2012

Keywords

  • Magnetic excitations
  • Quantum spin systems
  • Spin ladder
  • Anisotropic heat diffusion
  • Thermal imaging
  • THERMAL-CONDUCTIVITY
  • SR14CU24O41
  • INTERPLAY
  • FLUORESCENCE
  • MANAGEMENT
  • RESOLUTION
  • MAGNETISM
  • SR2CUO3
  • SRCUO2

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