Magnon Heat Transport in (Sr,La)_14Cu_24O_41

Details Magnon Heat Transport in (Sr,La)_14Cu_24O_41 Magnon Heat Transport in (Sr,La)_14Cu_24O_41

2001-05-21

arxiv.org/abs/cond-mat/0105407v1

Physics

Condensed Matter

6 pages, 5 figures, submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.64.184305

We have measured the thermal heat conductivity kappa of the compounds Sr_14Cu_24O_41 and Ca_9La_5Cu_24O_41 containing doped and undoped spin ladders, respectively. We find a huge anisotropy of both, the size and the temperature dependence of kappa which we interpret in terms of a very large heat conductivity due to the magnetic excitations of the one-dimensional spin ladders. This magnon heat conductivity decreases with increasing hole doping of the ladders. The magnon heat transport is analyzed theoretically using a simple kinetic model. From this analysis we determine the spin gap and the temperature dependent mean free path of the magnons which ranges by several thousand angstroms at low temperature. The relevance of several scattering channels for the magnon transport is discussed.

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