Thermal conductivity and specific heat of the linear chain cuprate Sr${}_2$CuO${}_3$: Evidence for thermal transport via spinons

Abstract

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.

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

References in corpus (3)

• Thermodynamics of Spin S = 1/2 Antiferromagnetic Uniform and Alternating-Exchange Heisenberg Chains
• Anisotropic spin freezing in the S=1/2 zigzag ladder compound SrCuO2
• Possible Localized Modes in the Uniform Quantum Heisenberg Chains of Sr2CuO3

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