Thermal conductivity of quasi-one-dimensional antiferromagnetic spin-chain materials

Details Thermal conductivity of quasi-one-dimensional antiferromagnetic spin-chain materials Thermal conductivity of quasi-one-dimensional antiferromagnetic spin-chain materials

2004-07-09

arxiv.org/abs/cond-mat/0407256v2

Phys. Rev. Lett. 94, 087201 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

4+epsilon pages, 1 figure. Short story. Long story is cond-mat/0407257

Scientific paper

10.1103/PhysRevLett.94.087201

We study heat transport in quasi-one-dimensional spin-chain systems by considering the model of one-dimensional bosonic spin excitations interacting with three-dimensional phonons and impurities in the limit of weak spin-lattice coupling and fast spin excitations. A combined effect of the phonon and impurity scatterings yields the following spin-boson thermal conductivity behavior: kappa_s ~ T^2 at low, kappa_s ~ 1/T at intermediate, and kappa_s = const at higher temperatures. Our results agree well with the existing experimental data for Sr2CuO3. We predict an unusual dependence on the impurity concentration for a number of observables and propose further experiments.

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