Thermal conductivity and specific heat of the linear chain cuprate Sr$_{2}$CuO$_{3}$: Evidence for thermal transport via spinons

Details Thermal conductivity and specific heat of the linear chain cuprate Sr$_{2}$CuO$_{3}$: Evidence for thermal transport via spinons Thermal conductivity and specific heat of the linear chain cuprate Sr$_{2}$CuO$_{3}$: Evidence for thermal transport via spinons

2000-07-24

arxiv.org/abs/cond-mat/0007359v1

Phys. Rev. B 62, R6108 (2000)

Physics

Condensed Matter

Strongly Correlated Electrons

4 RevTeX pages, 3 figures, to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.62.R6108

We report measurements of the specific heat and the thermal conductivity of the model Heisenberg spin-1/2 chain cuprate Sr$_{2}$CuO$_{3}$ at low temperatures. In addition to a nearly isotropic phonon heat transport, we find a quasi one-dimensional excess thermal conductivity along the chain direction, most likely associated with spin excitations (spinons). The spinon energy current is limited mainly by scattering on defects and phonons. Analyzing the specific heat data, the intrachain magnetic exchange $J/k_{B}$ is estimated to be 2650 K.

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